ML20043C572

LER 90-009-00:on 900430,discovered That Rod Block Monitor Not Been Proven Operable Prior to Exceeding 30% Power as Required by Tech Specs.Caused by Programmatic Deficiency. General Plant Procedures revised.W/900530 Ltr

ML20043C572
Person / Time
Site:	Peach Bottom
Issue date:	05/30/1990
From:	Fray J, Fulvio A PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-009-02, LER-90-9-2, NUDOCS 9006050343
Download: ML20043C572 (4)

Text

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~CCN-90-14107 3' ' i 4 .

PHILADELPHIA ELECTRIC COMPANY PEACil BOTIOM ATOMIC POWER STATION R. D.1, Box 208

- Delta, Pent:sylvania 17314 enxu morna-ns: rowns os excentNor . (717) 456-7014 h

t May 30, 1990 Docket No. 50-277 -i 4

Document Control Desk U. S. Nuclear Regulatory Commission Washington .OC 20555 i

SUBJECT:

Licensee Event-Report Peach Bottom Atomic Power Station - Unit 2 This LER concerns an event-in which a surveillance was not performed as i

. required by Technical Specifications.

Reference:

Docket No. 50-277  !

Report Number: 2-90-009 -l Revision Number: 00 l Event Date: 04/30/90  :!

Report Date: 05/30/90 '!

Facility: Peach Bottom Atomic Power Station .i RD 1. Box 208, Delta, PA 17314  !

This LER is being submitted pursuant to the requirements of 10 CFR l 50.73(a)(2)(1)(B). f Sincerely, .

j

, Plant Manager cc: J. J. Lyash, USNRC Senior Resident inspector T. T. Martin, USNRC, Region 1 9006050343 900530 PDR ADOCK 05000277 i S PDC

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On 4/30/90 at 1030 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91915e-4 months <br /> with Unit 2 at 38.3% power, it was discovered that the Rod Block Monitor (RBM) had not been proven operable prior to exceeding 30% power as required by Technical Specifications. The surveillance tests (S12N-60B-RBM-AlFM and S12N-608-RBM-B1FM), which are normally performed monthly to verify.RBM operability, had not been performed since 2/25/90 due to Unit 2 being in cold shutdown. S12N-60B-l RBM-AIFM and S12N-608-RBM-BlFM were completed satisfactorily on 4/30/90 at 1240 hours0.0144 days <br />0.344 hours <br />0.00205 weeks <br />4.7182e-4 months <br />. The root cause of this event was a programmatic deficiency in that it was an incorrect standard practice of performing these surveillance tests after reaching 30%

rated power. The appropriate General Plant procedures will be revised to ensure that the RBM has been proven operable prior to reaching 30% power. S12N-60B-RBM-AlfM and SI2N-60B-RBM-BlFM will be revised to allow performance with the RBM bypassed. A-43 l " Surveillance Testing System", will be revised to strengthen the requirement that surveillances be performed prior to returning a system to an operable status. There was one previous similar event identified. An assessment of the corrective actions l

taken as a result of this previous event will be performed and additional corrective actions will be taken as required.

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Mac e. asea . u.s. NUCLEAR 7.EIULATORY COMMMS80N T',. . ' UCENSEE EVENT REPORT (LER) TEXT CUNTINUATION ' Aarviovio ous No. aiso-oio6 L excitss: sisic q PAciLITY,NAME til DOCKli NUMStR (2) LER NUMSER (5) PAGE (31

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, Requirements for the Report cThis report is required per 10 CFR 50.73(a)(2)(1)(B) due to a surveillance not being performed when required by Technical Specifications.

Unit Condition at Time of Discovery 4

. Unit 2 was in the RUN Mode at 38.3% power.

There were no systems, structures, or components that were inoperable that contributed to this event.

Description of Event On 4/30/90 at:1030 hours with Unit 2 at 38.3% power, it was discovered that the Rod f Block Monitor (RBM) (Ells: MON) had not been proven operable prior to exceeding 30%

power.as required by Technical Specification 3.2.C. Surveillance tests SI2N-60B-RBM-A1FM and Sl2N-608-RBM-A1FM, "RBM Functional Checks", which are performed monthly to prove operability of the RBM when the reactor-is in the RUN Mode-and at greater than *

~ 30% power, had not been performed'on Unit 2 since 2/25/90 due to the unit being in cold shutdown (the RBM is bypassed at less than 30% power). :These tests were

scheduled -to be: performed during power ascension,- but could not be performed as written prior.to reaching 30% power.due to the RBM being bypassed as-designed, +

b At 1030 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91915e-4 months <br /> on 4/30/90, S12N-60B-RBM-AIFM was completed satisfactorily to prove the '

'A'~ channel RBM operable. AT 1240 hours0.0144 days <br />0.344 hours <br />0.00205 weeks <br />4.7182e-4 months <br />.on 4/30/90, with Unit 2 at 38.3% power,.

SI2N-60B-RBM-B1FM was completed satisfactorily to prove the 'B' channel RBM operable.

' Analysis'of Event

.There were no actual-safety consequences as a result of this event. S12N-608-RBM-A1FM and SI2N-608-RBM-B1FM perform functional tests of the ability of the 'A' and 'B' channels of the RBM to provide a control rod withdrawal block signal and associated alarms (Ells: ANN) at greater than 30% reactor power due to various input signals.

Technical Specification 3.2.C requires the RBM be functional in the RUN Mode when the signals are not bypassed (i.e., above 30% rated thermal power). -

Satisfactory performance of SI2N-60B-RBM-AlFM and SI2N-608-RBM-81FM at 1240 hours0.0144 days <br />0.344 hours <br />0.00205 weeks <br />4.7182e-4 months <br /> on

• 4/30/90 verified that the RBM was' operable.

Cause of the Event The root cause of this event was a programmatic deficiency in that it was an

' incorrect standard practice of performing these tests after reaching 30% rated power.

~A' contributing factor to the cause of this event is station procedures do not clearly state that SI2N-608-R8M-A1FM and S12N-608-RBM-B1FM must be performed prior to reaching 30% power.

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' "'- . LICENSEE EVENT REPORT (LER) TEXT CONTINUATION mRovto out No siso4io4

,- EXPIRES: B?31/03 .r FActLITY NAME (1) DOCKti NUM$tR L2) LER NUMSER 18) PAGE (3) -

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Corrective Actions l

Appropriate General Plant procedure (s) will be revised to eisure that the RBM has been proven operable prior to reaching 30% power.

S12N-60B-RBM-A1FM and SI2N-60B-RBM-BlfM will be revised to allow performance while the.RBM is. bypassed.

A-43, Surveillance Testing System", will be revised to strengthen the requirement that surveillances omitted due to a system being inoperable, be performed prior to returning a system to an operable status.

Previous Similar Events One previous similar LER'was identified. LER 3-89-11 reported an event in which ST's. .

were not~ performed prior to reaching an operational milestone requiring equipment- '

operability. -The corrective actions taken in LER 3-89-11 should have been effective in' preventing this event. An' assessment of the effectiveness and completeness of the  ;

corrective actions taken as a result of LER 3-89-11 will be performed and additional corrective actions will be taken as required.

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