ML18153C738

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LER 91-008-00:on 910814,charging Pump Component Cooling Pump a Tagged Out to Replace Pump Discharge Check Valve & Exceeded 24 H Lco.Caused by Unanticipated Delays During Maint.Engineering Evaluation performed.W/910913 Ltr
ML18153C738
Person / Time
Site: Surry Dominion icon.png
Issue date: 09/13/1991
From: Kansler M
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
91-541, LER-91-008-02, LER-91-8-2, NUDOCS 9109190269
Download: ML18153C738 (5)
v • d • e


Text

ACCELERATED DiTRIBUTION. DEMONSjATION. SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9109190269. DOC.DATE: 91/09/13 NOTARIZED: NO DOCKET#*

FACIL:50-281 Surry Power Station, Unit 2, Virginia Electric&. Powe 05000281 AUTH. NAME . AUTHOR AFFILIATION KANSLER,M.R. Virginia Power (Virginia* .Electric & Power Co.)

RECIP.NAME RECIPIENT AFFILIATION R

SUBJECT:

LER 91-008-00:on 910814,charging pump component cooling pump l A tagged out to replace pump discharge.check valve &

exceeded 24 h LCO.Caused by unanticipated delays during. D maint.Engineering evaluation performed.W/910913 ltr. *

  • DISTRIBUTION CODE: IE22T COPIES RECEIVED:LTR I ENCL~ SIZE:~-\..Y+--~~- s TITLE: 50.73/50.9 Licensee Event Report (LER),~ncident Rpt, etc.~

./

NOTES:lcy NMSS/IMSB/PM. 05000281 A

COPIES RECIPIENT COPIES RECIPIENT D ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-2 LA 1 1 PD2-2 PD 1 1

  • D BUCKLEY ,B

AEOD/DOA 1 1 AEOD/DSP/TPAB. 1 1 A.EOD/ROAB/DSP. 2 2 NRR/DET/ECMB 9H 1 1 NRR/DET/EMEB 7E 1 1 NRR/DLPQ/LHFBlO 1 1 NRR/DLPQ/LPEBlO 1 1 NRR/DOEA/OEAB 1 1 NRR/DREP/PRPBll 2 2 NRR/DST/SELB SD 1 1 NRR/DST/SICB8H3 1 1 NRRl!lS:J1,LSPLB8D1 1 1 NRR/DST/SRXB SE 1 .1 ~~FILC) 02 1 1 RES/DSIR/EIB 1 *1 ~GN2~~..s:e-..--FILE 01 i 1 EXTERNAL: EG&G BRYCE,J.H 3 3 L ST LOBBY WARD 1 1 NRC PDR 1 1 NSIC MURPHY,G.A 1 1 NSIC POORE,W. 1 *1 NUDOCS FULL TXT 1 1 R NOTES: 1 1 I D

s I

-A, D

D, NOTE TO ALL "RIDS" RECIPIENTS:

S:

PLEASE HELP US TO REDUCE \\'ASTE! CONTACT THE DOCUMENT CONTROL DESK, R00\1 Pl-37 (EXT. 20079) TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 34 ENCL 34

Virginia Electric and Power Company Surry Power Station P. 0. Box315 Surry, Virginia 23883

.- V

. September 13, 1991 U. S. Nuclear Regulatory Commission Serial No.: 91-541 Document Control Desk *

  • Gentlemen:

Pursuant to Surry Power Station Technical Specifications, Virginia Electric and Power Company hereby submits the following Licensee Event Report for Unit 2.

REPORT NUMBER 91-008-00 This report h:as been reviewed by the Station Nuclear Safety and Operating Committee and will be ruviewed by the Corporate Management Safety Review Committee.

Very truly yours,

. '.. ~

. '1- .

M. R. Kansle,r

. Station Manager Enclosure cc: Regional Administrator Suite 2900 101 Marietta Street, NW Atlanta, Georgia 30323

...f O rL r\ ~ ,:***

. *-91091902(:.9 91091:3 PDR ADOCK 05000281

. PIii:::

\

  • ll!RC Form 366 U.S. NUCLEAR REGULATORY COMMISSIO~

(9-83)

APPROVED 0MB NO. 3160-0104 LICENSEE EVENT REPORT (LER)

  • EXPIRES: 8/31 /88-FACILITY NAME (1) 'DOCKET NUMBER (2) I PAGE (3)

Surry P*ower.Station, Unit 2* o l510J010f218 11 1loF 013 TITLE 141 Unit 2 "A" Charging Pump Component Co~ling. Pump Exceeded Its 24-Hour Limiting Condition for Opel;'ation Due to Unexpected Events and Problems

  • EVENT DATE (5) LER NUMBER (6) REPORT DATE (7) OTHER FACILITIES INVOLVED (8)

FACILITY NAMES DOCKET NUMBER(S)

O I 5 I O 10 I O I I I.

oIs 1 4 1 9 1 OPERATiNG THIS REPORT IS .SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check one or mar* of the fol/o,ying) (11)

___ MODE__ N (9) _ _...._..,._--l 20.402(b) 20.405(c) 50.73(1H2Hivl 73.71(b)

POWER ,. 20.405(a)(1)(i) 50.38(c) (1) 50.73(11(2)(*) 73.71(c)

Lf~~L . 01 8 15 ,.....;.. 20.405(1)(1)(ii) 50.38(c)(2) 50.73(1)(2)(¥11) 0TH ER (Spsclfy In Abstroct

- ...........- " ' - ~ -.............-ol below and In Text, NRC Form X

20.405(1)(1 )(ill)

  • 50.73(1)(2)(1) 50.73(1H2Hvill)(A) 366A) 11:11111= 20.405(1)(1 )(Iv) 20.405(1)(1 )(v) 50.73(1)(2)(;1)*

50,73(1)(2)(11i)

LICENSEE CONTACT FOR THIS LER (12) 50.73(1)(2)(vlll)(B) 50.73(1)(2Hxl NAME TELEPHONE NUMBER AREA CODE M. R. Kansler, Station Manager 8 IO 4 3 1s I 7 1- 13 I 1 1s 14 1

COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)

MANUFAC- MANUFAC-CAUSE SYSTEM COMPONENT TURER TURER

.I I I I I 1- I I I I I I I I I I I I I I I I I I. I I I I '/i!i///i!i!/!!i//ii/1//////i///////li!iii/ii!i/!/i/

SUPPLEMENTAL REPORT EXPECTED 114) MONTH DAV VEAR n

  • YES (If v**, campier* EXPEC1"ED-SU8MISS10N PATE)

L......l.--------*-------------...L...=;i. X NO EXPECTED SUBMISSION DATE(15)

_____________- - l l - - - - - - ' - - - - - ..... I -I I ABSTRACT (Limit to 1400 spscas, i.e., approxlmstely fifteen sing/a,spsce typewritten lines) (16)

  • On August 14, 1991, at 0552 hours0.00639 days <br />0.153 hours <br />9.126984e-4 weeks <br />2.10036e-4 months <br />, with Unit 1 at 100% power, .. and
  • Unit 2 ramping from. 85% to 100% power, the Charging Pump . Component Cooling (CC) pump, 2-CC-P-2A, was tagged out to replace the pump* discharge check valve. A 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Limiting Condition for Operation (LCO) was entered in accordance with Technical Specification (TS) 3.13.B. Return to service testing act1v1t1es were delayed by a dropped rod and turbine runback transient that occurred at 1753
  • hours. When Post-Maintenance Testing (PMT) *activities were resumed at 2235 hours0.0259 days <br />0.621 hours <br />0.0037 weeks <br />8.504175e-4 months <br />, a pump flange leak* resulted in unplanned *maintenance. .The maintenance activities affected the system response of this ASME XI system, and the PMT .

results required engineering evaluation. The 24-hour LCO expired at 0552 hours0.00639 days <br />0.153 hours <br />9.126984e-4 weeks <br />2.10036e-4 months <br /> on August 15, and a 6-hour clock to Hot Shutdown (HSD) was then entered as per T.S. 3.0.1. At 0657 hours0.0076 days <br />0.183 hours <br />0.00109 weeks <br />2.499885e-4 months <br />, with repairs and testing complete, the pump was evaluated by Engineering personnel as operable, and the 6-hour clock to HSD was exited. The redundant system remained operable throughout' this event, and* the health and safety of the public were not adversely affected. The event was caused

~y unanticipated delays in maintenance and testing activities. This event is being reported pursuant to 10CFR50.73(b)(2)(i).

NRC Form 366 19-831

NRC Form 366A U.S. NUCLEAR REGULATORY COMMISSION (s.a::1 I.ICENSEE EVENT REPORT (LER) TEXT CONTINUATION APPROVED 0MB NO. liS0-0104 EXPIRES: 8/31 /88 FACILITY NAME (1) . OOCKET NUMBER (2) * . LEA NUMBER (&) PAGE (3)

YEAR :::::::::: SEQUENTIAL ::,:;:::::: REVISION

NUMBER  ;:;::::::: NUMBER SURRY PCMER STATI CN' 1.0 'RIPTION OF THE EVENT On August 14, 1991, at 0552 hours0.00639 days <br />0.153 hours <br />9.126984e-4 weeks <br />2.10036e-4 months <br />, with Unit 1 at 100% power, and Unit 2 ramping from 85% to 100% power, the
  • charging pump Component Cooling (CC) pump 2-CC-P-2A * {Ens:cc,P} was
  • tagged out for replacement of the pump discharge check .valve, 2-CC-764.

charging pump CC pump be operating, and that the spare pump be operable when a unit's reactor exceeds 350 DEGI:/450 PSIG. *

. At 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br />, the valve replacement was completed and tags were released. At 1753 hours0.0203 days <br />0.487 hours <br />0.0029 weeks <br />6.670165e-4 months <br />, Op~rations was preparing to perform the appropriate Post Maintenance Testing (PMT), when control rod assembly D-4 dropped, resulting in a turbine runback and a significant unit transient. During the ensuing five hours, operator attention was .

focused on addressing the dropped rod

  • transient. Off-duty personnel were called in to assist in completion of
  • the pump PMT. At 2235 ho\lrS, during testing activities, a leak was discovered at the discharge flange
  • of the pump, and the flange gasket had to be replaced. Subsequent pump post-maintenance test data required engineering evaluation.

Because of these unexpected events, the pump had not 'been returned to servii::e and declared operable as of 0552 hours0.00639 days <br />0.153 hours <br />9.126984e-4 weeks <br />2.10036e-4 months <br />; the expiration of the 24-hour LCO. A 6-hour clock to Hot Shutdown (HSD) was theri entered in accoirdance with T;S. 3.0.1. . At 0657 hours0.0076 days <br />0.183 hours <br />0.00109 weeks <br />2.499885e-4 months <br />, following engineering evaluation of the purrip Periodic Test acceptance criteria; the pump was determined to be operable, and the 6-hour. clock to HSD was terminated ..

This report is being submitted pursuant to 10 . CFR 50. 73(a)(2)(i)(B).

2.0 ~lFICANT SAFETY CONSEQUENCES AND IMPLICATIONS During normal *- operation, the charging pumps are used as

  • part of the Chemical arid Volume Control System (CVCS) {EIIS-CB}. Following a Safety Injection* (SI) actuation, the charging pumps are
  • used as High Head Safety Injec;tion pumps {EIIS-BQ,P}. The Charging Pump CC pumps proviide cooling water for the charging pump's mechanical *seals. This cooling water is required for the pump seals following* the Design Basis LOCA, after the Safety Injection System swaps from the Injection Phase to the Recirculation
  • Phase and draws water from the Containment Sump.

The redundant subsystem remained operable throughout this event, therefore, the health and safety of the public were not affected:

NRC FORM 366A

-*U.S. GPO: 198S-52l'-589 Ll0Ll7C '

. 3'

  • N RC Farm 3S8A . U.S. NUCLEAR REGULATORY COMMISSION (9-831 LICENSEE EVENT REPORT (LER) TEXT CONTINUATION APPROVED 0MB NO. 3150-0104 EXPIRES: 8/31 /88
  • FACILITY NAME (11 DOCKET NUMBER (2) LER NUMBER (61 PAGE (3)

SURRY POWER STATION, UNIT 2 I I I I I I ,I I I I I OF 1

- l - - - - ~ - - - - - - - - - - - - - - ' - 0 . . . . . . L . . 5 + - 0.J..O......L..O....J....:z:..J....l:8~,i.:..l.a. :::9~1.:::a.. l...L.--..&..::o:......*L..:0~8...L.......:O::.....i.=..O........:.O...J.:3"---'-..-..--0.._3-1 TEXT (ff more ,pace l.r f"lltlUltwd, u,- additional NRC Form 3llflA 'al 1171 3 .0 .cA!lSE OF THE EVENT The 1!xtension of CC pump inoperability 65 minutes beyond the 24-hour LCO was due to significant unanticipated delays during maintenance and testing activities.

  • 4.0 IMMEDIATE CORRECTIVE ACTION(S)

Off-duty personnel were called in to assist with expediting completion of the pump PMT, and preparations were made to commence a shutdown of the unit. The pump's

  • mechanical problems were corrected, and the PMT completed. An ISi engineering evaluation of the measured pump differential pressure was performed,. reviewed, and approved, and the pump was declared operable and returned to service at 0657
  • hours.

5 .0 . ADDITIONAL CORRECTIVE ACTION(S)

None 6.0 ACTIONS TO PREVENT RECURRENCE

. Station and Corporate Management policies are in effect which serve to minimize tim*e spent in Limiting Condition Action Statements for the perfo1mance of maintenance. Because of the nature of the unexpected events that occurred during the return to service of the pump, and the short duration of the LCO, the allowed 24-hour time period expired prior to satisfactory completion of the Post Maintenance Testing. Station Management will continue to emphasize and enforce these policies relating to coordination of maintenance requiring entry into Technical Specification Limiting Conditions* for Operation.

7~0 PREVIOUS EVENTS None 8.0

~- _19.__S_3j _ _ _ _ _

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