ML20058F761
| ML20058F761 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 11/16/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20058F760 | List: |
| References | |
| NUDOCS 9312080272 | |
| Download: ML20058F761 (3) | |
Text
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UNITED STATES i
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NUCLEAR REGULATORY COMMISSION f
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WASHINGTON. D.C. 205564001 0,
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SAFETY EVALUATIQM_BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NOS. 181 AND 186 TO FACILITY OPERATING LICENSE NOS. DPR-44 and DPR-56 PHILADELPHIA ELECTRIC COMPANY PUBLIC SERVICE ELECTRIC AND GAS COMPANY DELMARVA POWER AND LIGHT COMPANY ATLANTIC CITY ELECTRIC COMPANY PEACH BOTTOM ATOMIC POWER STATION. UNIT NOS. 2 AND 3 DOCKET NOS. 50-277 AND 50-278
1.0 INTRODUCTION
By letter dated August 20, 1993, the Philadelphia Electric company (the licensee) submitted a request for changes to the Peach Bottom Atomic Power Station (Peach Bottom), Unit Nos. 2 and 3, Technical Specifications (TS).
The requested changes would revise the surveillance requirements for the standby
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gas treatment system (SGTS) charcoal filter deluge system.
The revised surveillance requirements reflect the licensee's planned modification of the
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deluge system actuation from an automatic to a manual operation.
i 2.0 EVALUATION 2
1 2.1 Deluce System Modifications The standby gas treatment system is designed to limit the ground level release from the reactor building and to release primary and secondary containment air at an elevated release point during a postulated design basis accident. The system is designed so that offsite doses from the postulated design basis accident are below the guideline values of 10 CFR Part 100. The system consists of two parallel filter trains connected to three full-capacity exhaust fans.
Each filter train consists of a number of components in series including a moisture separator, high-efficiency filters and charcoal filters.
The charcoal filter trays are provided with a water sprinkler fire suppression system (deluge system) to provide protection against a fire in the charcoal filters. Water is provided to the system via a fixed piping system.
Currently, the SGTS deluge system is equipped with an automatic actuation feature.
Heat detectors in the SGTS provide a signal to actuate a solenoid valve, which in turn actuates a gate valve in the SGTS deluge system.
One deluge gate valve is provided for each redundant train of the SGTS.
Opening the deluge gate valve provides water to the deluge system sprinkler heads.
9312080272 931116 PDR ADDCK 05000277 P
. The licensee is planning to modify the actuation mechanism for the SGTS deluge system. The modification is being implemented to reduce the risk of inadvertent actuation of the deluge system. Such inadvertent actuations have occurred at Peach Bottom and render the affected charcoal filter train inoperable. The modification will replace the automatic action valve station (which is currently located in the specific SGTS room) with a new manual valve station in the adjacent stairvell. The manual station will consist of a system block valve which will control flow to the "A" and "B" SGTS train deluge supply systems and an isolation and control valve in series in each supply line. All of the valves will normally be locked closed with frangible locks.
In the event of a fire these locks can be broken by an individual by hand. Once the lock has been broken, the SGTS manual deluge system control valves can be operated.
The existing heat detectors will continue to provide an alarm to the control Upon actuation of the alarm, the plant fire brigade will be dispatched room.
to the scene to actuate the manual deluge system as appropriate. The licensee has concluded that the increase in system response time as a result of the change to manual actuation does not affect the consequences of a charcoal filter fire because response time is not critical due to the slow developing and non-flaming characteristics of charcoal bed fires.
2.2 Deluoe System Technical Soecifications Existing TS 4.14.A.7.a requires that the SGTS fire suppression spray system undergo a simulated automatic actuation test once every 18 months.
The licensee has proposed to change the surveillance requirement to a manual actuation test every 18 months.
The staff has reviewed the planned modification and the proposed TS change and has concluded that the planned modification does not cause a significant increase in the consequence of a charcoal filter train fire. The staff also concluded that the proposed change to the TS surveillance test, a once-per-18 month test of the manual block valves, will provide adequate assurance of the ability of the SGTS deluge system to pass water when required, and therefore, is acceptable.
In preparing the revised TS pages for the amendment application, the licensee made two typographical errors. The staff corrected the typographical errors.
The staff informed the licensee of the errors and corrections in a telephone call on October 25, 1993. The licensee agreed with the corrections.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Pennsylvania State official was notified of the proposed issuance of the amendments.
The State official had no comments.
SO r,
4.0 ENVIRONMENTAL CONSIDERATION
The amendments change a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and change the surveillance requirements. The NRC staff has determined that the amendments involve no significant increase.in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure.
The Commission has previously issued a~
proposed finding that the amendments involve no significant hazards consideration, and there has been no public comment on'such finding (58 FR 48387). Accordingly, the amendments meet the eligibility criteria for j
categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendments.
5.0 CONCLUSION
The Commission has concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's. regulations, and (3) the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
J. Shea Date:
November 16. 1993 e
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