ML20058L756
| ML20058L756 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 12/13/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20058L751 | List: |
| References | |
| NUDOCS 9312170179 | |
| Download: ML20058L756 (2) | |
Text
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UNITED STATES y
p, NUCLEAR REGULATORY COMMISSION r,,
2l WASHINGTON, D. C. 20555 s...../
SAFETY EVALUATION BY THE OFFICE OF NVCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.
52 TO FACILITY OPERATING LICENSE NO. NPF-58 THE CLEVELAND ELECTRIC ILLVMINATING COMPANY. ET AL.
PERRY NUCLEAR POWER PLANT. UNIT NO. 1 DOCKET NO. 50-440
1.0 INTRODUCTION
By letter dated June 28, 1991, the Cleveland Electric Illuminating Company, et al. (licensees), proposed changes to the Technical Specifications (TSs) for the Perry Nuclear Power Plant, Unit No. 1.
The proposed changes would modify TS 3.5.1, Emergency Core Cooling Systems - Operating.
Specifically, the amendment would add an Action statement to speci#y the actions to be taken in the event of an inoperable automatic depressurization system (ADS) safety related instrument air header low pressure alarm system instrumentation channel.
Under certain accident conditions, it might be necessary to rapidly depressurize the reactor vessel.
To accomplish this depressurization, ADS logic is installed for either automatic or manual actuation. When ADS is actuated, the eight associated main steam safety / relief valves are opened, relieving the reactor vessel pressure.
The valves are opened in the ADS mode by air supplied by accumulators. There are two accumulators for each ADS valve. The accumulators are pressurized by air from two separate safety related air headers.
Four of the ADS valves receive air from one of the headers while the remaining four ADS valves receive air from the other header.
The air pressure in each header is monitored by a pressure transmitter that provides indication and a low pressure alarm.
If the air pressure in either header decreases to the alarm setpoint, the annunciator will alert the operators to the problem.
2.0 EVALUATION The licensee has proposed to add an Action statement to TS 3.5.1.
The change would provios the licensee with clear guidance on what actions should be taken if one or both of the automatic depressurization system (ADS) safety related instrument air header low pressure alarm system instrumentation channels should become inoperable. At the present time, TS do not provide the licensee with any action to take if this problem occurs.
Lacking any other guidance, the licensee would be required to declare the ADS valves associated with the affected air header (s) inoperable.
TS 3.5.1 would then require the licensee to be in at least cold shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and reduce reactor steam dome pressure to less than or equal to 100 psig within the next 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. However, although one or both alarm channels are inoperable, this does not mean that the associated ADS valves will not perform their design 9312170179 931213 PDR ADOCK 05000440 p
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i function.
As long as the air pressure in the accumulators is maintained, the ADS valves would still be capable of performing properly. Therefore, a shutdown based only on an inoperable low pressure alarm channel would be unnecessary and may be contrary to plant safety.
l The licensee proposes that if one or both alarm channels become inoperable, i
the TS require the licensee to determine the associated ADS air header (s) i pressure from alternative indication and verify that ADS header pressure is greater than or equal to the alarm setpoint specified in Surveillance Requirement 4.5.1.e.2.c at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. At Perry, alternate indication of ADS header pressure is already available in the Control Room and locally in the Intermediate Building.
Since the air header pressure instruments do not directly support the operability of ADS, periodic verification that the pressure is above the TS alarm setpoint provides an adequate alternative means of monitoring ADS accumulator integrity.
Therefore, the proposed change to TS 3.5.1 is acceptable.
Finally, the licensee proposes to revise the TS Bases, Section 3/4.5.1 and l
3/4.5.2, ECCS - Operating and Shutdown, to address the change discussed above.
The staff finds the revised Bases acceptable.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Ohio State official was notified of the proposed issuance of the amendment. The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
This amendment involves a change to a requirement with respect to the instal-lation or use of a facility component located within the restricted area as defined in 10 CFR Part 20.
The staff has determined that the amendment involves 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 i
exposure.
The Commission has previously issued a proposed finding that this i
amendment involves no significant hazards consideration and there has been no public comment on such finding (56 FR 37590). Accordingly, this amendment l
meets the eligibility criteria for categorical exclusion set forth in 10 CFR 1
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 i
of this amendment.
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5.0 CONCLUSION
The staff 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 this amendment will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
Andrew J. Kugler Date:
December 13, 1993 1
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