SVP-99-037, Notifies NRC of Changes Concerning Two Commitments Re Fire Protection Made in Ltrs & 980522 for Quad Cities Nuclear Power Station
| ML20207L958 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 03/05/1999 |
| From: | Dimmette J COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| SVP-99-037, SVP-99-37, NUDOCS 9903180331 | |
| Download: ML20207L958 (2) | |
Text
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,- o>mmonweann niim,n o,miunt j Qu.nl Otics Gt neratmg station 22'lu 206th .hcour North l Girilosa. H. 612 62F to l ni w o n 22ii v
i SVP-99-037 i
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March 5,1999 l l
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U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D C 20555 Quad Cities Nuclear Power Station, Unit 1 and Unit 2 Facility Operating License Nos. DPR-29 and DPR-30 NRC Docket Nos. 50-254 and 50-265
Subject:
Reduction of Commitments Concerning Fire Protection
References:
(a) Letter from J. P. Dimmette, Jr. (Comed), SVP-98-203, to USNRC, dated May 22,1998, " Response to Questions Raised during Confirmatory Action Letter Closure Inspection and Summary of Fire
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Protection Compensatory Actions" O (b) Letter from E. S. Kraft (Comed), SVP-97-282, to USNRC, uated December 23,1997,"10CFR50, Appendix R" The purpose of this letter is to notify the NRC of a change concerning two commitments made in the referenced documents for Quad Cities Nuclear Power Station. In Reference (a), the station committed to fire watches as compensatory measures for weaknesses in our implementation of Appendix R safe shutdown requirements. In Reference (b;, the station described implementation of a three-person incipient fire Quick Response Team (QR) to provide an immediate response and communication for fire alarms in high vulnerability are.ts.
Reference (a) discussed specific issues concerning multiplc spurious operations and loss of 125 Vdc control power to certain 4 kV switchgear. This discussion included compensatory measures involving once per hour fire watches. Since exact cable routing information was not available, j these fire watches were implemented :n broad areas of the plant where 125 Vdc control power to the 4 kV busses could be potentially subject to fire damage and in the areas where multiple sperious operation of components h id the potential to adversely affect safe shutdown.
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USNRC 2 March 5,1999 SVP-99-037 i l
The station has now determined the routings of affected cables. As a result we have identified l the specific fire zones within plant fire areas that are susceptible to the 125 Vdc and multiple I spurious operations issues. Therefore, the station has reduced fire watches to monitor only the affected fire zones.
Reference (b) described a change to the dedicated compensatory-measure Quad Cities fire j brigade stafling. In September 1997 we implemented utilization of a five-person dedicated fire l l
brigade as a compensatory measure while the Unit I safe shutdown paths were inoperable. In December 1997 all Unit 1 safe shutdown paths were returned to operable status in accordance with an approved operability evaluation. The operability evaluation described replacement of i the five-person dedicated compensatory-measure fire brigade with the three-person incipient fire QRT.
Operability of the safe shutdown paths has since been established without reliance on the operability evaluation referred to in Reference (b). Also, as part of Quad Cities Fire Protection
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Improvement Program, a new and lower core damage frequency due to fire has been determined. i Therefore, the three-person incipient fire QRT has been disbanded and fire response is j accomplished through the use of the normal station fire brigade as described in station procedure l QAP 1170-17, " Fire Protection Program." l If there are any questions or comments concerning this letter, please refer them to Mr. Charles Peterson, Regulatory Assurance Manager, at (309) 654-2241, extension 3609.
Si cerely, 4
t rW dk yvwwd_ g-
- oel P. Dimmette, Jr.
Site Vice President Quad Cities Nuclear Power Station cc: Regional Administrator-NRC Region Ill NRC Senior Resident Inspector- Quad Cities Nuclear Power Station i