ML17335A466

LER 98-049-00:on 981020,emergency Boron Injection Flow Path Was Inoperable.Caused by Original Design Deficiency. Engineering Evaluation of Event Is Continuing

ML17335A466
Person / Time
Site:	Cook
Issue date:	01/05/1999
From:	Finissi M INDIANA MICHIGAN POWER CO.
To:
Shared Package
ML17335A465	List: ML17335A464 ML17335A466
References
LER-98-049, LER-98-49, NUDOCS 9901120180
Download: ML17335A466 (2)

Text

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FACIUTY NAME (1) DOCKET NUMBER (2) PAGE (2)

Cook Nuclear Plant Unit 1 05000-315 1 of 1 TITLE (e)

Interim - Emergency Boron Injection Flow Path Inoperable Due to Original Design Deficiency EVENT DATE (5) LER NUMBER (6) REPORT DATE (7) OTHER FACILITIES INVOLVED(8)

N MB SEQUENTIAL REVISION Cook Unit 2 05000-316 MONTH DAY YEAR YEAR NUMBER NUMBER MONTH DAY YEAR NU 10 20 1998 1998 00 01 05 1999 OPERATING THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR II: (Check one or more) (11)

MODE (9) 20.2201 (b) 20.2203(a)(2)(v) 50.73(a)(2)(i) 50.73(a)(2)(viii)

POWER 20.2203(a)(1) 20.2203(a)(3)(i) 50.73(a)(2)(ii) 50.73(a)(2)(x)

LEVEL (10) 000 20.2203(a)(3)(ii) 50.73(a)(2)(iii) 73.71 20.2203(a)(2)(l) 20.2203(a)(2)(II) 20.2203(a)(4) 50.73(a)(2)(iv) OTHER 20.2203(a)(2)(iii) 50.36(c)(1) 50.73(a)(2)(v)

Specify in Abstract below 20.2203(a)(2)(iv) 50.36(c)(2) 50.73(a)(2)(vii) or nNRCFonns66A UCENSEE CONTACT FOR THIS LER (12)

TELEPHONE NUMBER (Inc4de Area Code)

Mike Finissi, System Engineering Manager (616) 465-5901, x2830 COMPLETE ONE LINE FOR EACH COIIPONENT FAILURE DESCRIBED IN THIS REPORT (13)

REPORTABLE REPORTABLE TO CAUSE SYSTEM COMPONENT MANUFACTURER TO EPIX SYSTEM COMPONENT MANUFACTURER EPIX

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SUPPLEMENTAL REPORT EXPECTED 14 EXPECTED MONTH OAY X YES SUBMISSION 02 19 1999 (IfYes, complete EXPECTED SUBMISSION DATE NO DATE 15)

Abstract (Limit to 1400 spaces, I.e., approximately 15 single-spaced typewritten lines) (16)

On October 20 1998, with Units 1 and 2 in Mode 5,'Cold Shutdown, Engineering noted potential problems with emergency boron injection utilizing the Boric Acid Storage Tanks and the Boric Acid Transfer (BAT) Pumps to provide concentrated boric acid to the Reactor Coolant System (RCS) charging pump suction header. Technical Specifications (TS) 3.1.2.1 and 3.1.2.2 require boron injection flow paths to the RCS for reactivity control. One potential problem was that, in certain operating conditions, the BAT pumps may not have had adequate net positive suction head (NPSH). The second potential problem involved the possibility of boric acid precipitation degrading an emergency boron injection flow path.

There is no evidence that boron injection capability had actually been diminshed at any time. However, since the requisite number of emergency boron injection paths may not have been available in all applicable plant conditions, the emergency boron injection path is conservatively considered to have been inoperable. Therefore, there would have been times when the applicable TS action statements may not have been met. In accordance with 10CFR50.73(a)(2)(i)(B), this condition is being reported as a condition prohibited by the plant's TS.

Engineering evaluation of this event is continuing. Due to the complex nature of the potential problems and the system interfaces, additional time is being taken to evaluate the identified conditions. Current expectations are to submit an update to this LER by February 19, 1999.

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