ML20205T114

Provides Comments from Technical Review of Draft Info Notice Re Unanticipated Reactor Water Draindown at Quad Cities Nuclear Power Station,Unit 2,ANO,Unit 2 & JAFNPP

ML20205T114
Person / Time
Site:	Arkansas Nuclear, Quad Cities, FitzPatrick
Issue date:	04/22/1999
From:	Krich R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9904270149
Download: ML20205T114 (3)

Text

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Gimmonwealth Edison C mpany k 1400 Opm Place Doworrs Grove, 11 60515 5"01 April 22,1999 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Quad Cities Nuclear Power Otation, Unit 2 Facility Operating License No. DPR-30 NRC Docket No. 50-265

Subject:

Comments on a Draft Information Notice Describing the Unanticipated Reactor Water Draindown at Quad Cities Nuclear Power Station, Unit 2; Arkansas Nuclear One, Unit 2; and James A. Fitzpatrick Nuclear Power Plant This letter provides comments from a technical review of the Subject Draft Information Notice y/

(IN) sent to Commonwealth Edison (Comed) Company by ine NRC by letter dated April 15, 1999. We have reviewed the draft IN, and have attached comments from our review. The /

comments are limited to the event describcd at Quad Cities Nuclear Power Station, Unit 2, and do not address the events described at Arkansas Nuclear One, Unit 2, or the James A.

Fitzpatrick Nuclear Power Plant.

If you have any questions concerning this correspondence, please contact Mr. S. R. Dort at (630) 663-3741.

Respectfully, R.M. Krich Vice President - Regulatory Services Attachment cc: Regional Administrator- NRC Region 111 NRC Senior Resident inspector - Quad Cities Nuclear Power Station

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Comments on Draft Information Notice April 22,1999 Comments: -

Quad Cities Unit 2 Pace 1. Paracranh 1: I Original Sentence: On February 24,1999, Quad Cities Unit 2 was in cold shutdown with t eactor water temperature at about 144 degrets F and reactor water level in a band of 90 to 94 inches indicated level (normal level during operations is 30 inches indicated or about 173 inches above the top of active fuel [TAF]).

Change sentence to read: On February 24,1999, Quad Cities Unit 2 was in cold shutdown with reactor water temperature at about 131 degrees F and reactor water level at 80 inches indicated level (normal level during operations is 30 inches indicated or about 173 mehes above the top of active fuel [TAF]).

Pace 1 Paracranh 1:

Original Sentence: Core cooling was being maintained in a band...hy the "A" Loop of the residual heat removal (RHR) mode of shutdown cooling, after being switched from..12:32 a.m.

Change sentence to read: Core cooling was being maintained in a band...by the "A" Loop of the shutdown cooling mode of the residi. l heat removal (RHR) system, after being switched from..12:32 a.m.

Pace 1. Paracraph 2:

'iriginal Sentence: On the basis of post event reviews,it appears that the minimum t w valve was left open because the nuclear station operator failed to ensure that tasks were performed in the sequence specified in the operating procedures.

Change sentence to read: On the basis of post event reviews, it appears that a minimum flow valve in the "A" loop was left open because the nuclear station operator failed to ensure that tasks were performed in the sequence specified in the operating procedures.

Pace 2. Paracraph 1:

Original Sentence: To further complicate the event, the operating crew did not recognize that there was any problem until the water level had decreased about 13 inches.

Change sentence to read: To further complicate the event, the operating crew did not recognize that there was any problem until approximately 10 minutes had passed and the water level had decreased about 13 inches because of a misinterpretation of causes of the level decrease l

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l Pace 2. Parauraoh 2:

Original Sentence: Poor practices in operations including poor communications, poor activity briefings for high-risk activities, lack of pre-shift briefings, inadequate supervision ofimportant control room activities, inadequate monitoring of control room panels, and slow event response may have contributed to the event.

Change sentence to read: Poor practices in operations including poor communications, poor activity briefings for high-risk activities, lack of effective pre-shift briefings, inadequate supervision ofimportant control room activities, inadequate monitoring of control room panels, and slow event response may have contributed to the event. )

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