ML20044B955
| ML20044B955 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 03/08/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20044B954 | List: |
| References | |
| NUDOCS 9303150244 | |
| Download: ML20044B955 (3) | |
Text
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION g
WASHINGTON, D. C. 20555 s,..v.../
SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.178 TO FACILITY OPERATING LICENSt NO. NPF-3 TOLEDO EDISON COMPANY CENTERIOR SERVICE COMPANY AND THE CLEVELAND ELECTRIC ILLUMINATING COMPANY DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO. 1 DOCKET NO. 50-346
1.0 INTRODUCTION
By letter dated April 30, 1992, the Toledo Edison Company requested changes to the Technical Specifications (TS) for Davis-Besse, Unit 1.
The proposed changes would revise the TS related to reactivity control systems. The proposed changes, in addition to clarifying the present TS, would also delete the restriction for plant mode changes with one or more relative position indicator (RPI) channels inoperable.
2.0 EVALUATION The licensee has proposed to make the following changes to the TS:
a.
Section 3.1.3.1 would be revised to add word "and" to the end of the Action statement 3.1.3.1.c.2.a, 3.1.3.1.c.2.b and 3.1.3.1.c.2.c to clarify that Actions 3.1.3.1.c.2.a, b and c must be performed with either Actions 3.1.3.1.c.2.d or 3.1.3.1.c.2.e.
b.
Revise Action Statement 3.1.3.3.a.2 by stating that Startup and Power Operation may continue.
Revise Action Statement 3.1.3.3.a.2.c by adding references to TS section c.
3.1.3.5 and 3.1.3.9.
d.
Revise Action 3.1.3.3.b to clarify that the action applies for the situation of more than one RPI channel per control rod group inoperable and to clarify that the requirements of either section 3.1.3.3.a.1 or 3.1.3.3.a.2 must be met and allow startup or power operation to continue if the absolute position indication (API) channels for the affected control rods are operable.
9303150244 930308 PDR ADOCK 05000346 P
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Add a new action 3.1.3.3.c to state that the provisions of section 3.0.4 are not applicable, f
- The primary means of control rod position indication is provided by API while RPI provides the secondary means of position indication. Another means~of rod position indication is provided by the position reference indicators which provide position indication corresponding to 0, 25, 50, 75 and 100 percent withdrawn from the core.
t TS Section 3.0.4 states, in part, " Entry into an operational mode or other specified applicability condition shall not be made unless the conditions of the Limiting Condition for Operation (LCO) are met without reliance on provisions contained in the ACTION statements unless otherwise excepted."
However, NRC Generic Letter 87-09 states:
"For an LCO that has Action Requirements permitting continued operation for an unlimited period of time, entry into an operational mode or other specified condition of operation should be permitted in accordance with those Action Requirements." TS 3.0.4 unduly restricts plant operation while existing TS Action 3.1.3.3.a permits continued plant operation.
Therefore, exception to TS 3.0.4 is acceptable -
based on the conformance to criterion described in GL 87-09.
The TS Action 3.1.3.3.b currently allows operation in modes 1 and 2 to continue up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
The proposed change ~in this action statement will allow continuous operation provided the API channels are operable for the associated control rod assemblies. The API is a more reliable means of
. position indication than the RPI since during normal operation RPI is reset to match the API.
Therefore, the requirement to shut down is overly restrictive when the API is operable.
Also, TS Actions 3.1.3.3.a.2.a and 3.1.3.3.a.2.b~
provide another means of position indication in addition to API.
In the event that both API and RPI, for the same control rod assembly, become inoperable, TS 3.0.3 would require the plant shutdown to be initiated within I hour.
't Therefore, the staff finds the proposed changes to the TS acceptable.
Based on its evaluation of the licensee's submittal, the NRC staff has concluded that the proposed changes to the TS are acceptable.
The proposed changes are in accordance with the GL 87-09 and will remove unnecessary
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startup delays following plant outages and reduce unnecessary plant shutdowns.
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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.
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4.0 ENVIRONMENTAL CONSIDERATION
Pursuant to 10 CFR 51.21, 51.32, and 51.35, an environmental assessment and i
finding of no significant impact has been prepared and published in the Federal Reaister on February 11, 1993 (58 FR 8068
).
Accordingly, based i
upon the environmental assessment, the Commission has determined that the f
issuance of this amendment will not have a significant effect on the quality of the human environment.
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 i
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.
t Principal Contributor:
H. Garg r
Date:
March 8, 1993 i
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