ML17333B080

LER 97-020-00:on 970910,containment Recirculation Sump Inlet Venting Configuration Was Not Maintained Following Sump Mods.Caused by Incorrectly Identified Vent Holes.Five Vent Holes Have Been reestablished.W/971010 Ltr

ML17333B080
Person / Time
Site:	Cook
Issue date:	10/10/1997
From:	Blind A, Schoepf P INDIANA MICHIGAN POWER CO., INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-97-020, LER-97-20, NUDOCS 9710170035
Download: ML17333B080 (4)

Text

~ CATEGORY ~

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9710170035 DOC.DATE: 97/10/10 NOTARIZED: NO DOCKET FACIL:50-315 Donald C. Cook Nuclear Power Plant, Unit 1, Indiana M 05000315 AUTH. NAME AUTHOR AFFILIATION SCHOEPFPP. Indiana Michigan Power Co.

BLIND,A.A. Indiana Michigan Power Co. (formerly Indiana & Michigan Ele RECIP.NAME RECIPIENT AFFILIATION

SUBJECT:

LER 97-020-00:on 970910,containment. recirculation sump inlet venting configuration was not maintained following sump mods.Caused by incorrectly identified vent holes. Five vent holes have been reestablished;W/971010 ltr.

DISTRIBUTION CODE: IE22T Licensee COPIES RECEIVED:ITR / ENCL Event Report Incident g SIZE:

Rpt, etc.

2l TITLE: 50.73/50.9 (LER),

NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL 0 PD3-3 PD 1 1 HICKMAN,J 1 1 INTERNAL: B 2 2 AEOD/SPD/RRAB 1 1 ILE CEN 1 1 NRR/DE/ECGB 1 1 ELB 1 1 NRR/DE/EMEB 1 1 NRR/DRCH/HHFB 1 1 NRR/DRCH/H ICB 1 1 NRR/DRCH/HOLB 1 1 NRR/DRCH/HQMB 1 1 NRR/DRPM/PECB 1 1 NRR/DSSA/SPLB 1 1 NRR/DSSA/SRXB 1 1 RES/DET/EIB 1 1 RGN3 FILE 01 1 1 D

EXTERNAL: L ST LOBBY WARD 1 1 LITCO BRYCE,J H 1 1 NOAC POORE,W. 1 1 NOAC QUEENER,DS 1 1 0 NRC PDR 1 1 NUDOCS FULL TXT 1 1 U

N NOTE TO ALL "RIDSN RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083 FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 24 ENCL 24

(ndiana hlichigan Power Company Z

IMOIAMA NICHIGAN PWER October 10, 1997 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Operating Licenses DPR-58 Docket No. 50-315 Document Control Manager:

d i i i i R 97-020-00 Sincerely, A. A. Blind Site Vice President

/mbd Attachment A. B. Beach, Region III E. E. Fitzpatrick P. A. Barrett S. J. Brewer J. R. Padgett D. Hahn Records Center, INPO NRC Resident Inspector 9710170035 971010 PDR ADOCK 05000315 S PDR lllllllllllillllllllllllllllllllllllllll

NRC FORM 366 U.S. NUCLEAR REGULATORY COMHISSION APPROVED BY OMB NO. 3150.0104 (5 9>> .. EXPIRES 5/31/95 ESTIHATED BURDEN PER RESPONSE TO COMPLY WII'H THI INFORMATION COLLECTION REOUEST: 50.0 HRS. FORWAR LXCENSEE EVENT REPORT (LER) COHMENTS REGARDING BURDEN ESTIMATE TO TH INFORHATION AND RECORDS MANAGEMENT BRANCH (MNB 7714), U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, DC 20555 000'I, AND TO THE PAPERWOR REDUCTION PROJECT (3150-0104), OFFICE 0 MANAGEMENT AND BUDGET WASHINGTON DC 20503.

FACILITY NAHE (1) DOCKET NUMBER (2) Page 1 of1 Donald C. Cook Nuclear Plant ~ Unit 1 50.315 TITLE (4)

Interim LER - Failure to Maintain Recirculation Sump Vent Configuration Results in Condition Outside the Design Bases SEOUENTIAL REVI SION FACILITY NAME DOCKET NUMBER MONI'H HONTH DAY DAY YEAR YEAR NUMBER NUMBER Cook Unit 2 50-316 FACILITY NAME DOCKET NUMBER 09 10 97 97 020 00 10 10 OPERATING MODE (9) 20.2201(b) 20.2203(a)(3)(I) 50.73(a)(2)(iii) 73.71(b)

POWER 0

LEVEL (10) 20.2203(s)(2)(l) 20.2203(a)(4) 50.73(a)(2)(v) OTHER (Specify in 20.2203(s)(2)(iii) 50.36(c)(2) 50.73(s)(2)(viii)(A) Abstract below 20.2203(a)(2)(iv) 50.73(a)(2)(l) 50.73(a)(2)(viii)(B) snd in Text, 20.2203(a)(2)(v) 50.73(a)(2)(ii) 50.73(a)(2)(x) NRC Form 366A)

NAHE TELEPHONE NUHBER (Include Area Code Mr. Paul Schoepf, Safety Related Mechanical Engineering Superintendent 616/465-5901, x2408 REPORTABLE REPORTABLE CAUSE SYSTEM COHPOHENT MANUFACTURER CAUSE SYSTEM COMPONENT MANUFACTURER TO NPRDS TO NPRDS EXPECTED SUBMISSION X YES NO 17 97 DATE 15 ABS'TRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines) (16)

On September 10, 1997, with both units in Mode 5, cold shutdown, it was discovered that the containment recirculation sump inlet venting configuration was not maintained following sump modifications. This was determined to be reportable under 10CFR50.72(b)(2)(i), as a degraded condition found while shutdown, and an ENS notification was made at 1845 hours0.0214 days <br />0.513 hours <br />0.00305 weeks <br />7.020225e-4 months <br /> the same day. This interim LER is submitted under 10CFR50.73(a)(2)(ii), as a condition outside the design bases.

The need to'vent potentially trapped air from the inlet section of the recirculation sump was identified in 1979. To accomplish this, five 3/4" holes were drilled in the roof slab of the inlet section. Air would thus be vented before it could become entrained in the water flow exiting the sump to the suction of the Emergency Core Cooling System and Containment Spray System pumps. When the holes were found during the Unit 2 1996 refueling outage, they were incorrectly identified as abandoned equipment holes that exceeded the 1/4" particulate retention requirements for the recirculation sump. The Unit 2 vent holes were filled during the same outage and the Unit 1 holes were identified and filled during the 1997 refueling outage.

The five 3/4" vents holes have been reestablished in the recirculation sump inlet roof slab, and a 1/4" particulate retention elements have been installed on the vent holes. Physical modification of the recirculation sump has been completed. Documentation of the physical attributes and bases of the recirculation sump venting features is currently being revised. An update to this interim LER will be submitted by November 17, 1997, after completion of the investigation and analysis of this event.