ML17272A770

Notifies That GE Will Submit Vol II of Rept on Assessment of BWR Mitigation Capabilities Re ATWS for Current BWR Product Lines.Rept Contains Sufficient Info for NRC to Proceed W/ ATWS Rulemaking Based on Alternate 3 of NUREG-0460

ML17272A770
Person / Time
Site:	Columbia
Issue date:	12/26/1979
From:	Renberger D WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Harold Denton Office of Nuclear Reactor Regulation
References
GQL-79-231, NUDOCS 8001040455
Download: ML17272A770 (8)

Text

REGUlATORY It RMATION DISTRIBUTION SYST (RIDS)

ACCESSION NBR:8001040455. DOC DATE'9/12/26

~ NOTARIZED: NO . DOCKET ¹ "FAClt. 50-391"NP'PSS '

Nuclear,f'r'ojecti Unit 2~'Washington Public Powe 05000397 AO fH ~ NANE" "AUTHOR AFI'LLATION RENBERGKRjD,L, Wasliington- Pub'Iic Power Supply System "AECIP's NAME AECEPIENT AFFILIATION DFATUIAfHsR 07 f fee of NucTear Aeactor Regul at i on

SUBJECT:

Notifies that GEl will submitr Yol IIof rept on assessment of BWRitigation capabilities re"ATWS"for', current'BWR pioduct I,ines;Rept cont'ain5 su'fficient info. fot NRC. to pioceed rulemaking based on Alt'ernate 3 of ttOAEG 0460, w/'TWS oisTRrsuTiov coos: sooss cop<Es sEcnvsoiLvs jsNcct 4 size TLl'LE: Anticipated Transients w'ithout- Scram, NOTcS: cS ~ fN - 4 MS ALL W67L.

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Washington Public Power Supply System A JOINT OPERATING AGENCY P. O. BOX QBS 3000 GEO. WASHINCTON WAY RICHI.ANO, WASHINCTON 99352 PHONE (509) 375 5000 December 26, 1979 Docket No. 50-397 G02-79-231 Telecopy: H. D. Lynch Nr. Harold R. Denton Director, Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Siibject: WPPSS NUCLEAR PROJECT NO. 2 RESOLUTION OF ATWS

Reference:

Letter, HR Denton (NRC) to all licensees and applicants, dated October 17, 1979, same subject

Dear Hr. Denton:

Your October 17 letter to all power reactor licensees and license appli-cants implied that unless .all the information needed for early verifi-cation was-. provided in time for the rulemaking on ATWS scheduled for early 1980, the design basis accident approach (Alter nate 4) would be pursued.'. The General Electric Company will submit, at the end of the month, Volume II of its report on the assessment of BWR mitigation capabilities with respect to ATWS for the current BWR product lines.

We have reviewed the report and feel that the report contains sufficient information for the NRC to proceed with an ATWS rulemaking based on no more than Alternate 3 of NUREG-0460.

Your letter also encouraged the formation of utility/owners groups to minimize impact on staff and industry resources. We wish to emphasize that the utilities have also been impacted very heavily by efforts related "to THI'and thus we are extremely interested in generic approaches and utility/owners groups. As you know the BWR-TMI Owners Group com-prises virtually every BWR either operating or under construction. We have been working with General Electric in a similar fashion on ATWS for the past several years.

We are concerned that the Staff is being open ended in its requirements for early veri'fication and rulemaking. General Electric 's report represents a great deal of effort and is responsive to the needs of the

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HR Denton Page 2 Staff to verify the feasibility of the technical approach presented in Alter nate 3 to mitigate ATWS. Sensitivity studies were performed to cover the range of BWR's since time constraints have prohibited plant unique analyses. We are in the process of doing our own plant unique evaluation with respect to the GE report and evaluation of the balance of plant conditions imposed by the results of the analyses in the GE report. This evaluation clearly could not proceed until the GE report defining the conditions was completed. We are working directly with General Electric in this regard and preliminary assessment of the results indicates no substantial problems should arise. On this basis, we feel the staff has the information it needs to proceed with rule-making based on no more than Alternate 3. Imposition of other require-ments on the ATWS evaluation unrelated to the ATWS event itself, (e.g.

safety grade criteria, seismic + ATWS, etc) should not be imposed on the early verification program which is to verify the technical feasibility of Alternate 3 to allow a rule to be written with the confidence that it can be implemented.

We wish to participate in any meetings on ATWS. We and other BWR owners have obviously a great deal of interest in the prompt resolution of ATWS and wish to promote any efforts within our means to achieve this end.

We feel the GE report is responsive to the Staff's needs so rulemaking can proceed.

Very truly yours, D. L. RENBERGER Assistant Director Technology DLR:OKE:cph cc: A. Thadani - NRC MD Lynch - NRC L. Rubenstein - NRC SH Hannauer - NRC J. Weiss - GE/San Jose FA NacLean - GE/San Jose E. Chang - GE/San Jose JJ Verderber - B8R/NY R. Baldwin - 88R/NY J. Ellwanger -B8R/NY JR Lewis - BPA JD Lewis - EFSEC/Olympia WNP-2 Files

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PLANTS UNDER OL REVIEW Farley 2 50-364

2. Byron 1/2 50-454, 455

3. Braidwood 1/2 50-456/457 4, LaSalle 1/2 50-373, 374

5. Midland 1/2 50-329,330

6. McGuire 1/2 50-369, 370 7 0 So. Texas 1/2 50-498, 499

8. Shoreham 50-322

9. Waterford 50-382

10. Grand Gulf 1/2 50-416/417

11. Diablo Canyon 1/2 50-275, 323

12. Susquehana 1/2 50-387, 388

13. Salem 2 50-311

14. Summer 1 50-395 15.. San Onofre 2/3 50-361, 362

16. Bellefonte 1/2 50-438, 439

17. Watts"Bar 1/2 50-390, 391

18. Sequoyah 1/2 50-327, 328

19. Comanche Peak 1/2 50-445, 446

20. North Anna 2 50- 9

21. WPPSS-2 50-397

22. Fermi 2 50-341 23.' immer 1 50-358