ML17285B032

Responds to Request for Generic Approval Re 871215 Application for Amend to License NPF-21,revising Tech Specs to Allow Use of Final Feedwater Temp Reduction for Cycle Extension

ML17285B032
Person / Time
Site:	Columbia
Issue date:	02/14/1990
From:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GO2-90-024, GO2-90-24, NUDOCS 9002270034
Download: ML17285B032 (7)

Text

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ACCESSION NBR:9002270034 DOC.DATE: 90/02/14 NOTARIZED: NO DOCKET FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH. NAME AUTHOR AFFILIATION SORENSEN,G.C. Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Responds to request for info re 871215 application for amend to License NPF-21 re final feedwater temp reduction.

DISTRIBUTION CODE: A001D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: OR Submittal: General Distribution NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 PD 1 1 SAMWORTH,R 5 5 INTERNAL: ACRS 6 6 NRR/DET/ECMB 9H 1 1 NRR/DOEA/OTSB11 1' NRR/DST/SELB 8D NRR/DST/SRXB 8E 1,

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WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Box 968 ~ 3000 George Washington Way ~ Richland, Washington 99352 February 14, 1990 Docket No. 50-397 G02-90-024 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Gentlemen:

Subject:

NUCLEAR PLANT NO. 2, OPERATING LICENSE NPF-21 REQUEST FOR ANENDHENT TO TECHNICAL SPECIFICATIONS, FINAL FEEDWATER TEMPERATURE REDUCTION (FFTR}

Reference:

1) Letter, G02-87-286, GC Sorensen (SS) to NRC, same subject, dated December 15, 1987

2) Letter, G02-88-198, GC Sorensen (SS) to NRC, same subject, dated September 14, 1988

3) Letter, G02-89-102, GC Sorensen (SS) to NRC, "Request for Amendment to Technical Specifications, Reload License Amendment (Cycle 5), Additional Information", dated June 1, 1989 Numerous telephone conference calls have been held with the Staff since the initial submittal of the Supply System's request +(Reference 1) for generic approval of the use of Final Feedwater Temperature /eduction (FFTR). Many involved technical issues concerning the submittal itspTf, while others were more concerned with material questions (especially feedwater nozzles) and 'the impact the use of FFTR might have on them. In most cases, a response in writing was not required. However, for the following items a written response was requested.

1) Reducing feedwater temperature from 420'F to 355'F would reduce the water temperature at the beltline region an insignificant amount (from 533'F to 526.5'F).

2) The material and carbon content of the specific components of interest are as foll'ows:

a. Thermal Sleeve - SA336, Cl 8 (F304) material with 0.035% maximum carbon specified. Actual carbon content of 0.019% for heat 8652154.

9002270034 9002i4 PDR ADQCK 05000397.

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, Page Two REQUEST FOR AMEND. TO TS FINAL FEEDWATER TEMPERATURE REDUCTION

b. Thermal Sleeve Extension - SB166 (Inconel alloy 600) materi al .

Actual carbon content of 0.09% for heat ¹NX4116-G.

c. Reducing Tee - A240 Tp 304 material. Actual carbon content of 0.064%

for heat ¹311566.

d. Concentric Reducer - SA182 F304 material. Actual carbon content of 0.072% for heat ¹71550.

e. Header Pipe(s) - SA312 Tp 304 material. Actual carbon content of 0.050% for heat ¹F50266 and 0.049% for heat ¹F41502.

f. Nozzle safe ends - SB166 ( Inconel alloy 600) material.

3) The "rapid duty cycle maps" referred to in NEDC-31107, paragraph 5.2 are found in "BWR Feedwater Nozzle Sparger Final Report " dated March 1978, NEDE-21821-A (Supplement 2, February 1980), section 4.7.2.4.

4) The Supply System was asked to confirm the type of weld filler material that was used in the four (4) welds shown in Figure 121.8-1 (i.e. Inconel-82 versus Inconel-182). We assume this is related to the GE SIL No. 455, Revision 1 dated February 22, 1988.

Two of the four welds (see attachment) have been confirmed as containing Inconel-182 material, and it is assumed the other two also contain the same material. The Supply System does not believe that resolution of the Staff's Inconel-182 concerns should be germane to the Staff's approval of the Supply System's request to operate at reduced feedwater temperature at EOC for the purpose of extending the cycle. The Inconel-182 weld metal concerns are not so sensitive to final temperature that FFTR (as compared to normal, anticipated operating conditions) in itself should be a concern.

However, in the interest of resolution of this issue, the Supply System agrees to ultrasonically examine the bore and inner radius of one feedwater nozzle at the refueling outage following the use of FFTR for cycle extension (if one nozzle was already scheduled for examination, that would suffice). The examination will comply with the Augmented Feedwater Nozzle Examination Program the Supply System has previously committed to in the ISI Program Plan submitted to the NRC May 29, 1985.

Page Three REQUEST FOR AMEND. TO TS FINAL FEEDWATER TEMPERATURE REDUCTION It is the Supply System's understanding that this resolves all outstanding issues regarding the Supply'ystem's requ'est for generic approval of the use of FFTR for cycle extension. Based on WNP-2's current operating performance, the Supply System could need to have this amendment in place as early as February 28, 1990, in order to avoid a reduction in power.

Very truly yours, G. C. Sorensen, Manager Regulatory Programs HLA/bk Attachments CC: JB Martin - NRC RV NS Reynolds - BCP&R RB Samworth - NRC DL Williams - BPA/399 NRC Site Inspector - 901A

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