ML17289A843

Application for Amend to License NPF-21,changing TS Figure 3.1.5-2 Re Sodium Pentaborate Tank,Vol Vs Concentration Requirements to Reflect Actual Low Vol Alarm & Low Limit Values for Standby Liquid Control Tank

ML17289A843
Person / Time
Site:	Columbia
Issue date:	09/02/1992
From:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17289A844	List: ML17289A843 ML17289A845
References
GO2-92-210, NUDOCS 9209140226
Download: ML17289A843 (8)

Text

,ACCELERATED D "TRIBVTIONDEMONS RATION SYSTEM REGULAT INFORMATION DISTRIBUTION YSTEM (R IDS)

ACGESSION NBR: 9'20'7140226 DOC. DATE: 92/09/02 NOTARIZED: YES DOCKET FACIL:~50-O'P7 NPPSS Nuclear Pro Ject< Unit 2i Washington Public Powe 05000397 AUTH. NAME AUTHOR AFFILIATION SORENSENi G. C. Washington Public Power Supply System RECIP. NAME RECIPlENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Application 0'or amend to License NPF-21~ changing TS Figure R

3. l. 5-2 v e sodium pentabov ate tank. vol vs concentv ation v equirements to v et lect actual low vol alav m 5 low limit values for standby liquid contv ol tank.

p DISTRIBUTION CODE: A001D COPIES RECEIVED: LTR ENCL SIZE:

TITLE: OR Submittal: General Distribution NOTES:

REC IP IENT COPIES RECIPIENT COP IES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA PD5 PD 1 DEAN> M. 2 2 INTERNAL: ACRS 6 6 NRR/DET/ESGB 1 1 NRR/DOEA/OTSB1,1 1 1 NRR/DST/SELB 7E 1 1 NRR/DST/SICBSH7 1 1 NRR/DST/SRXB SE 1 1 NUDOCS-ABSTRACT 1 1 1 0 OGC/HDSi 1 0 EQ FILE 1 RES/DSIR/EIB 1 1 EXTERNAL:. NRC PDR 1 1 NSIC NOTE TO ALL RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK.

ROOM Pl-S7 (EXT. 504-2065) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 22 ENCL 20

WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Bm968 ~ 3000 George Wasbtngton Way ~ Rtcbrand, lPasbtngton 993524968 ~ (509) 372-5000 September 2, 1992 G02-92-210 Docket No. 50-397 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Gentlemen:

Subject:

WNP-2, OPERATING LICENSE NPF-21 REQUEST FOR AMENDMENT TO TECHNICAL SPECIFICATION FIGURE 3. 1. 5-2 SODIUM PENTABORATE TANK, VOLUME VS CONCENTRATION REQUIREMENTS In accordance with the Code of Federal Regulations, Title 10 Parts 50.90 and

2. 101, the Supply System hereby submits a request for amendment to the WNP-2 Technical Specifications. Specifically, this proposal requests that the subject figure be revised (as attached) to reflect the actual low volume alarm and low limit values for the Standby Liquid Control (SLC) tank. The present figure indicates a low level alarm at 4587 gallons'which is also the low limit for the tank volume. An alarm at the low limit is not prudent design, as receiving an alarm at that level would not allow for corrective actions before violating the Technical Specifications. The actual low level alarm is at 4682 gallons which provides adequate margin to take corrective action before exceeding the low level limit of 4587 gallons.

The SLC system is designed to provide shutdown capability without control rod movement. The SLC system consists of the sodium pentaborate solution storage tank, two pumps, piping and valves to transfer borated water from the tank to the reactor pressure vessel. Figure 3. 1.5-2 provides the limits of solution and volume neccessary to ensure that the SLC system is capable of fulfilling the system design function. Further, 10 CFR 50.62 specifies that for Anticipated Transient Without Scram (ATWS) mitigation the SLC system shall have the capability in flowrate, B" enrichment, and boron concentration such that, when accounting for reactor pressure vessel volume, an equivalent injection rate of 86 gallons per minute of 13 weight percent sodium pentaborate decahydrate solution at the natural B" enrichment can be attained. Operation within -the limits of figure 3. 1.5-2 ensures compliance with these requirements.

Figure 3. 1.5-2 was revised in Amendment 43 to the Technical Specifications, as requested by the Supply System, in response to the ATWS rule. An oversight was made in that the Amendment 43 request did not identify that the low level alarm in the figure should have been noted as the low level limit and the low level alarm should have been denoted at 4682 gallons. The attached figure corrects this discrepancy.

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RE(UEST FOR AMENDMENT TO TECHNICAL SPECIFICATION FIGURE 3.1.5-2 SODIUM PENTABORATE TANK, VOLUME VS CONCENTRATION RE(UIREMENTS The Supply System has evaluated this amendment request per 10 CFR 50.92 and determined that it does not represent a significant hazards consideration because it does not:

1) Involve a significant increase in the probability or consequences of an accident previously evaluated because the change corrects the Technical Specifications to reflect the correct and more conservative operating capability of the design. In this instance there is no increase in the probability or consequences of an accident previously evaluated because no changes in concentration limits or volume are proposed by this change.

The Technical Specifications are being changed to recognize the more prudent operating mode of the SLC storage tank in that margin is available, and has always been available, after a low level alarm. The margin allows corrective action to be taken prior to exceeding Technical Specification limits. In summary, a more prudent mode of operating is recognized by this change and the design requirements of volume and concentration are not changed. Hence, the accident analyses remains unaffected by this change.

2) Create the possibility of a new or different kind of accident from any accident previously evaluated because the SLC function and reliability are not affected by this change. No new modes of plant operation are introduced with this change. Hence, no new or different kind of accident is credible.

3) Involve a significant reduction in a margin of safety because as stated above, no change to the required volume and concentrations are being proposed by this change. Neither the original design or accident analysis is affected by this change. A more prudent mode of operation, that currently exists, is recognized by this proposal. Therefore, there is no impact to a margin of safety with this change.

As discussed above, the Supply System considers that this change does not involve a significant hazards consideration, nor is there a potential for significant change in the types or significant increase in the amount of any effluents that may be released offsite, nor does it involve a significant increase in individual or cumulative occupational radiation exposure. Accordingly, the proposed change meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(C)(9) and therefore, per 10 CFR 51.22(b), an environmental assessment of the change is not required.

'Page 3 REqUEST FOR AMENDMENT TO TECHNICAL SPECIFICATION FIGURE 3.1.5-2 SODIUM PENTABORATE TANK, VOLUME VS CONCENTRATION RE(UIREMENTS This Technical Specification change has been reviewed and approved by the WNP-2 Plant Operations Committee and the Supply System Corporate Nuclear Safety Review Board. In accordance with 10 CFR 50.91, the State of Washington has been provided a copy of this letter.

Very truly yours, G. C. iSorensen, Manager Regulatory Programs PLP/bk Attachments CC: RG Waldo - EFSEC JB Martin - NRC RV NS Reynolds - Winston 8 Strawn R Assa - NRC DL Williams - BPA/399 NRC Site Inspector - 901A

~ STA1E OF WASHINGTON)

Subject:

Re uest for Amend to TS - SLC

)

COUNTY OF BENTON I. G. C. SORENSEN, being duly sworn, subscribe to and say that I am the Manager, Regulatory Programs for the WASHINGTON PUBLIC POWER SUPPLY SYSTEM, the applicant herein; that I have the full authority to execute this oath; that I have reviewed the foregoing; and that to the best of my knowledge, information, and belief the statements made in it are true.

DATE + ~C/ 1992 G. C. Sor, nsen, Manager Regulatory Programs On this date personally appeared before me G. C. SORENSEN, to me known to be the individual who executed the foregoing instrument, and acknowledged that he signed the same as his free act and deed for the uses and purposes herein mentioned.

GIVEN under my hand and seal this ~today of 1992.

No y Public in a d for the STATE OF WASHINGTON Residing at Kennewick Washin ton My Commission Expires A ril 28 1994 t.A

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