ML18022A652

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LER 88-014-00:on 880520,discovered Two RCS Wide Range Pressure Inputs for Subcooling Margin Monitor Calculations Had Been Changed.Caused by Inadequate Procedure Controls. Procedures revised.W/880620 Ltr
ML18022A652
Person / Time
Site: Harris Duke Energy icon.png
Issue date: 06/20/1988
From: Schwabenbauer, Watson R
CAROLINA POWER & LIGHT CO.
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
HO-880127-(O), LER-88-014, LER-88-14, NUDOCS 8806280388
Download: ML18022A652 (8)


Text

REGULATOR" NFORMATION DISTRIBUTION SvRTEM (RIDS>

'CCESSION -NBR: 8806280388 DOC. DATE: 88/06/20 NOTARIZED: NO DOCKET FACIL: 50-400 Shearon Harris Nuclear Power Planti Unit ii Carolina 05000400 AUTH. NAME, AUTHOR *FF ILIATION SCHW*BENBAUER Carolina Poeer 5 Light Co.

WATSON'. A. Carolina Power Zc Light Co.

RECIP. NAME RECIPIENT AFFILIATION

SUBJECT:

LER 88-014-00: on 880520'iscovered teo RCS eide range pressure inputs for subcooling margin monitor calculations had been changed. Caused bg inadequate procedure controls.

Procedures revised. W/880620 ltr.

DISTRIBUTION CODE: IE22D COPIES RECEIVED: LTR J ENCL g SIZE TITLE: 50.'73 Licensee Event Report <LER)i Incident Rpti etc.

NOTES: Application for permit reneeal filed. 05000400 REC IP I ENT COPIES REC IP IENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-1 LA 1 1 PD2-1 PD 1 1 BUCKLEY'S B 1 1 INTERN*L: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 AEOD/DOA 1 1 AEOD/DSP/NAS 1 1 AEOD/DSP/ROAB 2 AEOD/DSP/TPAB ~ 1 1 ARM/DCTS/D*B 1 1 DEDRO 1 1 NRR/DEST/ADS 7E 1 0 NRR/DEST/CEB 8H 1 1 NRR/DEBT/ESB 8D 1 1 NRR/DEST/ICSB 7 1 1 NRR/DEST/MEB 'PH 1 1 NRR/DEST/MTB 9H 1 1 NRR/DEST/PSB 8D 1 NRR/DEST/RSB 8E 1 1 NRR/DEBT/SGB 8D 1 1 NRR/DLPQ/HFB 10 1 1 NRR/DLPQ/QAB 10 1 1 NRR/DOEA/EAB 11 1 1 NRR/DREP/RAB 10 1 1 NRR/DREP/RPB 10 2 2 NRR/J3 IB 9A 1 1 NUDOCS-ABSTRACT 1 1 EG IL 02 1 1 RES TELFORDi J 1 RESIDE/EIB 1 1 RES/DRPS DEPY 1 1 RGN2 FILE 01 1 1 EXTERNAL: EG8cG WILLIAMS' 4 4 FORD BLDG HOYLE A 1 1 H ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC HARRIS' 1 1 NSIC MAYST G 1 1 TOT*L NUMBER OF COPIES REQUIRED: LTTR 45 ENCL 44

NRC Form 388 UA. NUCLEAR REOULATORY COMMISSION (983)

APPROVEO OMB NO. 3150410l EXPIRES: 8/31/88 LICENSEE EVENT REPORT (LER)

FACILITY NAME (I) DOCKET NUMBER (2) PACE 3 SHEARON HARRIS NUCLEAR POWER PLANT UNIT 1 0 5 0 0 0 4 0 0 1 OF 0 5 SUBCOOLING MARGIN MONITOR USING UNVERIFIED COMPUTER INPUTS FOR CALCULATIONS DUE TO PROCEDURAL DEFICIENCY EVENT DATE (5I LE R NUMBER (8) REPORT DATE (7) OTHER FACILITIES INVOLVED (8)

'EovsNTIAL k% 'UMBER 'jg. NVMSSII MONTH REvrsrCN OAY YEAR FACILITYNAMES DOCKET NUMBER(SI DAY YEAR YEAR MONTH 0 5 0 0 0 052 0 8 8 8 8 0 1 4 0 0 06 20 8 8 0 5 0 0 0 OPERATINO THIS REPORT IS SUBMITTED PURSUANT T0 THE REQUIREMENTS OF 10 CF R g: (Cnrck onr or morr of chr follorylnpl (I'I MODE (8) (ill)

] 20A02(t) 20AOS(e) 50,73(e) (2) (Ir) 73.71(S)

POWER 20A05(e)(l) II) 5034(c) (I I 50,73(e)(2)(r) 73.71(c) 100 20A05(e)(l) (8) 50.38(c) (2) 50.73(e)(2)(eS) OTHER (Specify In Aotrrrct Below rnd In Trxt, HRC Pone 20A05(e) (I ) 50.73(e) (2) (I) 50,73(e) (2) (rill)(AI r

20A05(e) (I ) (Ie) 50.73(e) (2) (II) 50,73(e) (2)(rill )(BI

%V 366'AME o 20A05 (e I (1)(e) 50.73(e)(2) (SB 50,73(e)(2)(x)

LICENSEE CONTACT FOR THIS Ltn (12)

TELEPHONE NUMBER RICHARD SCHWABENBAUER REGULATORY COMPLIANCE TECHNICIAN AREA CODE 9 193 62 -266 9 COMPLETE ONE LINE FOR tACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)

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Yol SUPPLEMENTAL REPORT EXPECTED (Ie) MONTH DAY YEAR EXPECTED SU 8 M I SS ION DATE (15)

YES (lf yrr, complrtr EXPECTED SUBMISSION DATEI NO

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ABSTRACT:

The plant was operating in Mode I, Power Operation, at 100 percent reactor power on May 20, 1988 1615 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.145075e-4 months <br />, it was discovered that the two Reactor Coolant System (RCS) wide-range pressure inputs for the subcooling margin monitor calculations had been changed, and that no surveillance tests for verifying the accuracy of the Input to the subcooltng margin monitor existed, The event was discovered by Maintenance procedure writers while reviewing a Plant Change Request (PCR) which changed the inputs, but the PCR indicated no procedure changes were required. It hns been determined that this conditton has existed since May 1987 at which time the new configuration was betng tested by a vendor nnd was not returned to original status upon completion of the testing, Due to this modtfication, no surveillance testing had verified the accuracy of these computer points which resulted in the subcooling monitor using unverified inputs, The cause of the event was inadequate procedure controls which led to an inadequate review of the PCR for procedural changes and procedural deficiency in the Iac)( of control of the modification to the configuration of the test inputs, At 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br /> on Mny 20, 1988, The subcoollng monitor was declared Inoperable and alternate methods for monitoring RCS subcooling were initiated as required by Tec~nical Specrftcattons.

Corrective actions include procedure revisions to test the accuracy of the new computer points, and a more detailed review of the PCRs for procedure changes, The revised tests were successfully performed and the subcooling monttor returned to service nt 1653 hours0.0191 days <br />0.459 hours <br />0.00273 weeks <br />6.289665e-4 months <br /> on May 21, 1988 were no safety consequences as a result of this event and ts being reported in accordance

'here with IOCFR50,73(n)(2)(i )(8) as a violation of Technical Specifications PDR ADOCN, 0500QQO400 PDR NRC Form 388 (943) c r, ~~+re'n A p .. ie

NRC Foam 358A U.S. NUCLEAR REGULATORY COMMISSION (943)

LICENSEE EVENT REPORT ILER) TEXT CONTINUATION APPROVEO OMB NO. 3150-0108 EXPIRES: 8/31/88 FACILITY NAME (1) OOCKET NUMBER (2) LER NUMBER (Sl PAGE (3)

SHEARON HARRIS NUCLEAR POWER'LANT YEAR p~( SEOVSNT/AL NVVSSR

.)'~9 4SYIS/04

>+'VMSS4 UNIT 1 o so o o4 00 8 0 1 0 0 0 2 OF 0 5 TEKT /// m///e N/Pce /P /4/vie@ 14P //////4////IC An4 355l 9/ (17)

DESCRIPTION:

The plant was operating 'in MODE 1, Power Operation, at 100 percent reactor power on May 20, 1988.

In May 1987 a modification was developed for software in the Safety Parameter Display Subsystem (SPDS) which resides on the Plant Monitoring System/

Emergency Response Facilities Information System (ERFIS) computer (EIIS:ID).

The software modification to the plant computer was being tested by a vendor. The modification changed computer points used in the Subcooling Margin Monitor (SMM)(EIIS:AB). Upon completion of this testing, the software was not changed back to its original configuration due to lack of administrative control.

The modification changed the wide-range Reactor Coolant System (RCS) (EIIS:AB) pressure inputs to the SMM. The original configuration used computer points PRC0440 and PRC0441 inputs and were calibr'ated by Maintenance Surveillance Test (MST)-I0248, Reactor Coolant System Cold Overpressurization Instrument (P-0440) Calibration, and MST-I0249, Reactor Coolant System Co'd Overpressurization Instrument (P-0441) Calibration. The modification changed these inputs to PRC0402 and PRC0403 which were not covered by exi-sting procedures to verify the accuracy of these computer points. During the time frame of May 1987 to May 20, 1988, credit was 'taken for running the Calibration Procedures MST-I0248 and MST"I0249 on the subcooling margin monitor inputs.

The misconfiguration came to light on May 16, 1988, when three Plant Change Requests (PCR) 566, 792, and 3173 were being implemented to modify software in the SPDS. Each of these PCRs listed Engineering Periodic Test (EPT)-014, Safety Parameter Display System Test, as the only required acceptance/qualification testing.

h Upon reviewing the 'approved PCRs, maintenance procedure writers recognized that PCR-792 changed which wide-range RCS pressure inputs the subcooling monitor uses. . At this time, it was discovered that no surveillance test existed to verify the accuracy of these computer points and that the subcooling monitor was using unverified inputs.

This problem was brought to the attention of the Project Engineer Computer by the Maintenance Procedure Coordinator at '1615 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.145075e-4 months <br /> on May 20, 1988.- The Project Engineer - Computer then recognized that Maintenance Surveillance Test (MST)-C0001, Core Subcooling Margin Monitor Computation Check, also should NRC FORM 3554 4 U.S GPO:1988.0 021.538/45S (983)

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NRC Form 366A U.S. NUCLEAR REOULATORY COMMISSION (9831

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LICENSEE EVENT REPORT ILERI TEXT CONTINUATION APPROVEO OMB NO. 3150-0(04 EXPIRES: 8/31/88.

FACILITY NAME (11 DOCKET NUMBER (1) LER NUMBER (61 ~ AOE (31

' '9 SEQVENTIAL '

PRC0402 and PRC0403.

3. Modification Procedure (MOD)-208, Software/Database Changes for Process Computers, has been approved to ensure tighter controls of modifications and that PCRs are properly reviewed for possible procedure changes due to modifications.
4. The modification review process is being evaluated to ensure that all units review modifications for comments and identification of procedure changes. The appropriate procedure(s) will be revised as necessary as a result of this evaluation.

1 NAC FOAM SSSA 4 U.S.OPO:10854.82i 538/i55 (083) Carolina Power & Light Company HARRIS NUCLEAR PROJECT P.O. Box 165 New Hill, NC 27562 JUN 20 f988 File Number.'HF/10-13510C Letter Number'HO-880127 (0) U.S. Nuclear Regulatory Commission ATTN: NRC Document Control Desk Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT 1 DOCKET NO. 50"400 LICENSE NO. NPF"63 LICENSEE 'EVENT'EPORT 88-014-00 Gentlemen.'n accordance with Title 10 to the Code of Federal Regulations, the enclosed Licensee Event Report is submitted. This report fulfills the requirement for a written report within thirty (30) days of a reportable occurrence and is in accordance with the format set forth in NUREG-1022, September 1983. Very truly yours, Scud~ R. A. Watson Vice President Harris Nuclear Project RJS:dj Enclosure cc'. Dr. J. Nelson Grace (NRC RII) Mr. B. Buckley (NRR) Mr. G. Maxwell (NRC SHNPP) MEM/LER-88-014/1/OS1