ML17286B058
| ML17286B058 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 09/23/1991 |
| From: | Eng P Office of Nuclear Reactor Regulation |
| To: | Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| Shared Package | |
| ML17286B059 | List: |
| References | |
| TEY-12-91, NUDOCS 9110070018 | |
| Download: ML17286B058 (8) | |
Text
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pl 0 4~*y4 Docket No. 50-397 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON. D.C. 20555 September 23, 1991 Mr. G.
C. Sorensen, Manager Regulatory Programs Washington Public Power Supply System 3000 George Washington Way P.O.Box 968 Richland, Washington 99352
Dear Mr. Sorensen:
SUBJECT:
EVALUATION OF OFFSITE DOSE CALCULATION MANUAL, REVISION 8 FOR THE WASHINGTON PUBLIC POWER SUPPLY SYSTEM NUCLEAR PROJECT NO.
2 By letter dated February 22, 1991, you submitted Amendment 8 to the Washington Public Power Supply System Nuclear Project No.
2 (WNP-2) Offsite Dose Calcula-tion Manual (ODCM).
The NRC contractor, EG&G Idaho, Inc., previously reviewed Amendment 6 to the ODCM. Comments generated during their review were transmitted to you by our [[letter::GO2-89-159, Responds to NRC Bulletin 89-002, Stress Corrosion Cracking of High-Hardness Type 410 Stainless Steel Internal Preloaded Bolting in Anchor Darling Model S35OW Swing Check Valves or Similar Design. Results of Review Listed|letter dated September 12, 1989]].
Amendments 7 and 8 have since been issued.
Amendments 7 and 8 modified the ODCM as follows:
l.
Editorial changes were made to clarify certain portions and/or to make ODCM wording identical to that in the technical specifications.
2.
Additional dose calculation data was added.
Numerical values were corrected or updated.
4.
Changes or explanations were made in response to the [[letter::GO2-89-159, Responds to NRC Bulletin 89-002, Stress Corrosion Cracking of High-Hardness Type 410 Stainless Steel Internal Preloaded Bolting in Anchor Darling Model S35OW Swing Check Valves or Similar Design. Results of Review Listed|September 12, 1989, letter]] concerning unresolved items identified during the review of Amendment 6 to the ODCM.
A copy of EG&G's letter review report of Amendment 8 to the ODCM is enclosed.
The enclosure also contains pertinent prior correspondence concerning items discussed during the review of Amendments 4 and 6, applicable rationales furnished by WNP-2 to justify changes made by Amendments 5, 6, and 7.
The most significant deficiency identified appears to be due to an oversight in the correlation of the "river dilution" parameter in the WNP-2 calculations.
The value of 2,000 given in Table 2-3 for use in LADTAP II seems inconsistent with the near-field liquid dilution factor of 500 used in Section 2.4.
Therefore, the doses calculated for fish consumption are a factor of 4 too low.
Mr. G.
C. Sorenson 2>>
The river dilution parameter should be reviewed and revised if necessary to ensure that the semi-annual reports required by 10 CFR 50.36a(2) provide the best estimate of radioactive doses.
EGIIG also noted that the ODCM contains methodology to calculate the maximum organ dose to an individual due to release of radioactive material in airborne effluent which will give conservative results.
The doses are conservatively large because they are calculated for a "pseudo-organ" for which the dose commitment due to each pathway and radionuclide is equal to the highest dose commitment to any real organ for the pathway and radionuclide.
This conser-vatism should be noted in the ODCM.
Should you have any questions on this matter, please contact me.
Sincerely,
,ORIGIAL $[QNEP gy
Enclosure:
EGIFG Letter Report TEY-12-91 cc w/enclosure:
See next page Patricia L. Eng, Project Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation DISTRIBUTION R~FW
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Mr. G'.
C. Sorenson EGKG also noted that the ODCM contains methodology to calculate the maximum organ dose to an individual due to release of radioactive material in airborne effluent which will give conservative results.
The doses are conservatively large because they are calculated for a "pseudo-organ" for which the dose commitment due to each pathway and radionuclide is equal to the highest dose commitment to any real organ for the pathway and radionuclide.
This conser-vatism should be noted.
Should you have any questions on this matter, please contact me.
Sincerely,
Enclosure:
EGSG Letter Report TEY-12-91 cc w/enclosure:
See next page Patricia L. Eng, Project Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation D IS TRI BUTION Doc et Fs e
RCesaro PD5 Plant NRC 5 Local PDRs PEng RZimmerman, RV PD5 Reading BBoger MVirgilio OGC EJordan ACRS (10)
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The river dilution parameter should be reviewed and revised if necessary to ensure that the semi-annual reports required by 10 CFR 50.36a(2) provide the best estimate of radioactive doses.
EGIIG also noted that the ODCM contains methodology to calculate the maximum organ dose to an individual due to release of radioactive material in airborne effluent which will give conservative results.
The doses are conservatively large because they are calculated for a "pseudo-organ" for which the dose commitment due to each pathway and radionuclide is equal to the highest dose comitment to any real organ for the pathway and radionuclide.
This conser-vatism should be noted in the ODCM.
Should you have any questions on this matter, please contact me.
S incere ly,
,ORlGlNAL SIGNED BY
Enclosure:
EGIFG Letter Report TEY-12-91 cc w/enclosure:
See next page Patricia L. Eng, Project Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation DISTRIBUTION Doc et Fs e
RCesaro PD5 Plant NRC
& Local PDRs PEng RZimerman, RV PDS Reading BBoger MVirgilio OGC EJordan ACRS (10)
LCunningham JHayes
- GYuhas, RV D
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C. Sorenson The river dilution parameter should be reviewed and revised if necessary to ensure that the semi-annual reports required by 10 CFR 50.36a(2) provide the best estimate of radioactive doses.
EGSG also noted that the ODCN contains methodology to calculate the maximum organ dose to an individual due to release of radioactive material in airborne effluent which will give conservative results.
The doses are conservatively large because they are calculated for a "pseudo-organ" for which the dose commitment due to each pathway and radionuclide is equal to the highest dose comnitment to any real organ for the pathway and radionuclide.
This conser-vatism should be noted in the ODCH.
Should you have any questions on this matter, please contact me.
S'ncere
Enclosure:
EG&G Letter Report TEY-12-91 cc w/enclosure:
See next page Patricia L. Eng, Proje t Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation
- Mr. G. C. Sorensen Washington Public Power Supply System WPPSS Nuclear Project No.
2 (WNP-2)
CC:
Mr. J.
W. Baker WNP-2 Plant Manager Washington Public Power Supply System P.O.
Box 968, MD 927M Richland, Washington 99352 G. E.
C. Doupe, Esq.
Washington Public Power Supply System 3000 George Washington Way P. 0.
Box 968 Richland, Washington 99532 Mr. R. G. Waldo, Chairman Energy Facility Site Evaluation Council Mail Stop PY-11 Olympia, Washington 98504 Mr. Alan G. Hosier, Licensing Manager Washington Public Power Supply System P. 0.
Box 968, MD 956B Richland, Washington 99352 Mr. A. Lee Oxsen, Acting Managing Director for Operations Washington Public Power Supply System P. 0.
Box 968, MD 1023
- Richland, Washington 99352 Mr. Gary D. Bouchey, Director Licensing and Assurance Washington Public Power Supply System P. 0.
Box 968, MD 280 Richland, Washington 99352 Regional Administrator, Region V
U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Chairman Benton County Board of Commissioners P. 0.
Box 190
- Prosser, Washington 99350-0190 Mr. R.
C. Sorensen U. S. Nuclear Regulatory Comnission P. 0.
Box 69 Richland, Washington 99352 Nicholas S. Reynolds, Esq.
Winston I% Strawn 1400 L Street, N.W.
Washington, D.C.
20005-3502