ML17286B151

Application for Amend to License NPF-21,changing Tech Spec Table 3.3.6-1.4.a, Control Rod Block Intermediate-Range Monitor Not Full in Signal to Delete Footnote Which States That Signal Bypassed When Detectors in Range 1

ML17286B151
Person / Time
Site:	Columbia
Issue date:	11/18/1991
From:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17286B152	List: ML17286B151 ML17286B153
References
GO2-91-212, NUDOCS 9111260153
Download: ML17286B151 (4)

Text

A,CCFLERATED DISTRIBUTION DEMONSTRATION SYSTEM REGULATORY INFORMATION DISTRIBUTION~,SYSTEM (RIDS)

ACCESSION NBR:9111260153 DOC.DATE: 91/11/18 NOTARIZED: YES 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:

Application for amend to License NPF-21,changing Tech Spec Table 3.3.6-1.4.a, "Control Rod Block Intermediate-Range Monitor Not Full in Signal" to delete footnote which states that signal bypassed when detectors in Range 1. D DISTRIBUTION CODE: ROOID TITLE: OR COPIES RECEIVED:LTR Submittal: General Distribution I ENCL L SIZE: WI NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL D PD5 LA 1 1 PD5 PD 1 1 ENG,P.L. 2 2 D

INTERNAL: ACRS 6 6 NRR/DET/ECMB 7D 1 1 NRR/DET/ESGB 1 1 NRR/DOEA/OTSBll 1 1 NRR/DST 8E2 1 1 NRR/DST/SELB 7E 1 1 NRR/DST/SICB8H7 1 1 NRR/DST/SRXB 8E 1 1 NUDOCS-ABSTRACT 1 1 OC/LF 1 0 OGC/HDS 1 1 0 RE~CXE 1 1 RES/DSIR/EIB 1 1 EXTERNAL: NRC PDR 1 1 NSIC 1 1 R

D A

D D

NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM P 1-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 24 ENCL 22

~y WASHINGTON PUBLIC POWER SUPPLY SYSTEM F.O. Box 968 ~ 3000 George Washington Way ~ Richland, Washington 99352 November 18, 1991 G02-91-212 Docket No. 50-397 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 AMENDMENT TO TS TABLE 3.3.6-1.4.a CONTROL ROD BLOCK INTERMEDIATE RANGE MONITOR NOT FULL IN SIGNAL 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 footnote

"(e)" applicability to item 4.a of the subject table be deleted as states that the detector not full in signal is "bypassed" when the detectors are it incorrectly in range l. (see attached).

The Intermediate Range Monitor System (IRH) provides neutron flux (power) level indication during reactor startup and plant heatup and provides reactor trip or control rod block signals if the IRH system detects abnormal flux conditions, malfunctions, or is not positioned correctly in the core. The IRH detectors are mechanically inserted and withdrawn from the core depending on plant conditions.

During startup and plant heatup the monitors are fully inserted. During power operation the monitors are withdrawn from the core when the range of the IRM instrument is exceeded. Prior to withdrawal, overlap between the IRH and the Average Power Range Monitoring System (APRH) is confirmed and the APRH system power indication and trip signals are relied on after the IRHs are withdrawn.

Further, withdrawal of the IRHs from the core prolongs the life of the monitors as they are not exposed to the higher neutron flux levels associated with continuous power operation.

During conditions when the IRHs are required, if they were not in the "full in" position the indicated power signal and any trip or rod block signals could be nonconservative. For this reason a "detector not full in" rod block signal is provided to assure that rods cannot be withdrawn from the core when the detectors are not positioned correctly.

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