ML17334A676

LER 98-006-00:on 980129,determined That Procedural Option for Weighing of Ice Baskets in Modes 3 & 4 Was Potentially Unanalyzed Condition.Cause Undeterminate.Procedure Will Be Revised

ML17334A676
Person / Time
Site:	Cook
Issue date:	03/03/1998
From:	Schoepf P AMERICAN ELECTRIC POWER CO., INC.
To:
Shared Package
ML17334A675	List: ML17334A674 ML17334A676
References
LER-98-006, LER-98-6, NUDOCS 9803120055
Download: ML17334A676 (1)

Text

HRC FORM 366 U.S. NUCLEAR REGULA'TORY COMMISSION APPROVED BY OMB NO. 3150.0104 (5.92) EXPIRES 5/31/95 ESTIMATED BURDEN PER RESPOHSE To COMPLY WITH THI INFORMATION COLLECTION REQUEST: 50.0 HRS. FORWAR LICENSEE EVENT REPORT (LER) COHMENTS REGARDING BURDEN ESTIHATE To TH IHFORMATION AND RECORDS MANAGEMENT BRANCH (MHB 7714), U.S. NUCLEAR REGULATORY COMHISSION, WASHINGTON, DC 20555-0001, AND 'IO THE PAPERWOR REDUCTIOH PROJECT (3150-0104), OFFICE 0 MANAGEHENT AND BUDGET WASHINGTON DC 20503.

FACILITY NAME (1) DOCKET NUMBER (2) Page1 of1 Donald C. Cook Nuclear Plant - Unit 1 50.315 TITLE (4)

Interim LER - Procedural Option for Weighing of Ice Baskets in Modes 3 and 4 Determined to be a Potentially Unanalyzed Condition EVENT DATE 5 LER NUMBER 6 REPORT DA'TE 7 OTHER FACILITIES INVOLVED 8 SEQUENTIAL REVI SION FACILITY NAME DOCKE'I NUMBER MONTH DAY YEAR YEAR MONTH DAY YEAR HUHBER NUMBER Cook - Unit 2 50-316 FACILITY NAME DOCKET NUMBER 01 29 98 98 006 00 03 03 OPERA'TING TH S REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR  : Check one or mor e 11 MODE (9) 20.2201(b) 20.2203(a)(3)(l) 50.73(a)(2)(iii) 73.71(b)

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20.2203 a 1 20.2203 a 3 ii 50.73 a 2 iv 73.710 LEVEL (10) 20.2203(a)(2)(I) 20.2203(a)(4) 50.73(a)(2)(v) OTHER 20.2203 a 2 ii 50.36 c 1 50.73 a 2 vii (Specify in 20.2203(a)(2)(iii) 50.36(c)(2) 50.73(a)(2)(viii)(A) Abstract betoM 20.2203(a)(2)(iv) 50.73(a)(2)(l) 50.73(a)(2)(viii)(B) and in Text, NRC Fore 366A) 20.2203(a)(2)(v) X 50.73(a)(2)(ii) 50.73(a)(2)(x)

LICENSEE CONTACT FOR THIS I.ER 12 NAME TELEPHONE NUMBER (Include Area Code)

Mr. Paul Schoepf, Safety Related Mechanical Engineering Superintendent 616/465-5901, x2408 COMP ETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED 'IN T HIS REPORT 13 CAUSE SYSTEM COMPONENT MANUFACTURER 'o REPORTABLE HPRDS CAUSE SYSTEH COHPONENT MANUFACTURER REPORTABLE To NPRDS SUPPLEMENTAL REPORT EXPECTED 14 EXPECTED MONTH DAY YEAR YES SUBMISSION X (If yes, corptete EXPEC'IED SUBMISSION DATE). No DATE (15) 04 03 98 ABS'TRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typeiiritten lines) (16)

On February 25, 1998, an ENS notification was made in accordance with 10CFR50.72(b)(2)(l) for a condition found while the

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reactor was shutdown, which if it had been found while the reactor'was operating, could have resulted in the plant being in an unanalyzed condition. This notification was the result of an issue raised in late January, 1998 regarding the basis for a step in the ice basket weighing procedure which allowed for up to 60 baskets to be unpinned at a time for weighing during Modes 3 and

4. A search for the basis for the procedural step allowing the unpinning of the 60 baskets was conducted and no documentation could be located. It was subsequently determined that the plant could have been in an unanalyzed condition during the periods when that specific portion of the procedure was performed, and the February 25, 1998 notification was made. This interim LER is therefore submitted in accordance with 10CFR50.73(a)(2)(l)(B), for an unanalyzed condition.

The ice condenser consists of 24 bays containing 81 baskets each, arranged in a 300 degree arc between the containment and crane walls. The baskets are required to contain a minimum weight of borated ice, and a surveillance is periodically performed to weigh a representative sample of the baskets to assure that the minimum weight requirement is met. To perform this surveillance, the baskets are physically lifted and weighed. The ice baskets are held down by a u-bolt arrangement attached to the lower support beam with a clevis pin, which is necessary to prevent movement of the basket during LOCA and seismic events. The clevis pin must be removed to lift and weigh the basket.

Ice baskets are no longer unpinned during Modes 3 and 4, and recollection of cognizant plant personnel is that this procedural option has not been used in more than ten years. Archive records are being reviewed to ascertain the last time the baskets were unpinned in this manner. Because online basket unpinning is no longer necessary for the performance of basket weighing, the procedure will be revised to eliminate this option. It is expected that an update to this interim LER will be submitted by April 3, 1998.

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