BIL TITLE: "ASSAY OF STD REFERENCE MAT'L (SRM) 950B"
SPONSORING OFFICE(S) SD

THIS RIL TRANSMITS THE RESULTS OF A COMPLETED PHASE OF RESEARCH ON THE ASSAY DETERMINATION OF URANIUM IN STANDARD REFERENCE
MATERIAL (SRM) 950B, IN RESPONSE TO A NEED TO IMPROVE THE QUALITY OF MEASUREMENTS MADE ON SPECIAL NUCLEAR MATERIAL FOR CONTROL AND
ACCOUNTING PURPOSES. THE PURPOSE OF THE WORK WAS TO DEVELOP AND CERTIFY A URANIUM OXIDE (U308) ASSAY STANDARD TO REPLACE THE
VIRTUALLY DEPLETED SRM 950A, USED IN NONDESTRUCTIVE ASSAYS.

THE RESEARCH RESULTS INDICATE THAT THE NEWLY DEVELOPED SRM 9508 CALIBRATION STANDARD HAS A CERTIFIED VALUE OF 99.97 +/- 0.02
PERCENT URANIUM OXIDE (U308).
THESE RESULTS ARE EXPECTED TO IMPROVE THE STANDARDIZATION AND CALIBRATION CAPABILITY OF BOTH NRC FIELD INSPECTORS AND THE NUCLEAR
INDUSTRY AS A WHOLE; THEY ARE EXPECTED TO HAVE A SIGNIFICANT NEAR-TERM IMPACT ON CURRENT SD GUIDES THAT WILL ADDRESS THE
IMPLEMENTATION OF 10 CFR 70.57, LICENSEES MEASUREMENT CONTROL PLANS.

TEST APPLICATIONS ARE BEING CONDUCTED TO DETERMINE USER SUITABILITY.

USER OFFICE REVIEWER: B. HATTER

*** NRR APPLICATION TO THE REGULATORY PROCESS *** NO RESPONSE RECEIVED.

USER OFFICE REVIEWER' N. GAMMILL

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42

RIL TITLE: IMPROVEMENTS IN AEROSOL BEHAVIOR CODE (LMFBR'S).

IMPROVEMENTS IN THE AEROSOL BEHAVIOR CODE FOR RADIOLOGICAL ASSESSMENTS OF LMFBR'S

RES COMMENTS

SODIUM OXIDE

IS THE KEY AEROSOL CONSTITUENT IN POSTULATED SEVERE LMFBR ACCIDENTS.
THIS MEMORANDUM TRANSMITS THE RESULTS OF COMPLETED RESEARCH ON THE MEASUREMENT OF SODIUM OXIDE AEROSOL PROPERTIES.
AEROSOL
FOR THE MOST SEVERE POSTULATED LMFBR ACCIDENT SCENARIOS (HCDA AND CORE MELT), SODIUM-OXIDE AEROSOL REPRESENTS THE HIGHEST AIRBORNE
MASS CONCENTRATIONS IN THE CONTAINMENT VESSEL AND IS EXPECTED TO DOMINATE AND GOVERN THE BEHAVIOR OF THE FUEL AND FISSION PRODUCT
SODIUM-OXIDE AEROSOL.
THEREFORE, AS A FIRST STEP IN IMPROVING THE AEROSOL BEHAVIOR CODE, HAARM-2, SEPARATE EFFECTS WORK WAS CARRIED OUT ON
THE RESULTS OF THESE SEPARATE EFFECTS MEASUREMENTS HAVE BEEN INCORPORATED INTO THE MODELS OF THE AEROSOL BEHAVIOR CODE HAARM-2,
AND TOGETHER WITH SOME ADDITIONAL IMPROVEMENTS USED TO GENERATE A NEW VERSION CALLED HAARM-3. THE IMPROVED MODELS IN HAARM-3
BEHAVIOR DURING A POSTULATED HCDA.
PROVIDE A MORE REALISTIC DESCRIPTION OF PARTICLE CHARACTERISTICS AND THEREBY ALLOW IMPROVED ESTIMATES OF SODIUM-OXIDE AEROSOL
THE HAARM CODE IS USED BY NRR FOR LMFBR SITE RADIOLOGICAL CONSEQUENCE ASSESSMENT.

CODE DESCRIBED IN THIS RIL, HAARM-3, IS USED BY NRR IN CALCULATING THE EFFECTS OF FAST REACTOR ACCIDENTS. IT IS BASED ON A
MODIFICATIONS IS CONFIRMED IN LARGE SCALE TESTS AT HEDL.
PREVIOUS CODE HAARM-2, NOW MODIFIED TO REFLECT THE RESULTS OF MILLIKAN CELL EXPERIMENTS AT BCL. THE GENERAL EFFECT OF THE

*** NRR: IMPACT OF RESULTS ***

AN LMFBR CONTAINMENT IN THE EVENT OF A LARGE ACCIDENT.
CONFIRMATION OF THE NEW CODE PERMITS A REDUCTION BY AS MUCH AS A FACTOR OF 2-8 IN THE AMOUNT OF RADIOACTIVE AEROSOLS LEAKED FROM
(RADIOACTIVE GASES ARE NOT CONSIDERED TO BE AFFECTED.)

*** NRR: COMMENTS AND REMARKS ***

ACCIDENT CONSEQUENCES.
THE ATTENUATION OF RADIOACTIVE AIRBORNE MATERIALS BY AGGLOMERATION AND FALLOUT IS AN IMPORTANT FACTOR IN THE CALCULATION OF
COMPARABLE TO AN ENGINEERED SAFETY FEATURE.
EVALUATION AND VERIFICATION OF THIS NATURAL MECHANISM FOR REDUCING RADIOACTIVE EMISSIONS HAS SIGNIFICANCE

PLUTONIUM ACCIDENT CONTAINER PROGRAM RESEARCH, DESIGN AND DEVELOPMENT.

RES COMMENTS

RESULTS ARE REPORTED ON THE DESIGN, DEVELOPMENT AND TEST OF THE PAT-1 PLUTONIUM PACKAGE THAT MEETS THE NRC QUALIFICATION CRITERIA
PUBLISHED IN NUREG-0360 "QUALIFICATION CRITERIA TO CERTIFY A PACKAGE FOR AIR TRANSPORT OF PLUTONIUM."

NUCLEAR DECAY DATA FOR RADIONUCLIDES OCCURRING IN ROUTINE RELEASES FROM NUCLEAR FUEL CYCLE FACILITIES

RES COMMENTS

*** NRR : COMMENTS AND REMARKS ****

A MACHINE READABLE FILE IS AVAILABLE FROM K. ECKERMAN, NRR/DSE/RAB.