ML20126K537
| ML20126K537 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 05/12/1981 |
| From: | Janecek R COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20126K540 | List: |
| References | |
| NUDOCS 8105180250 | |
| Download: ML20126K537 (2) | |
Text
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Address Reply to: Post Othee Box 767 i
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rP May 12, 1981
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Mr. Harold R. Denton, Director b
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'U.S. Nuclear Regulatory. Commission u
' Washington, DC 20555
Subject:
Quad Cities Station Unit'2 Proposed Amendment to Appendix A, Technical' Specifications, to Facility Operating License DPR-30 NRC Docket No. 50-265 References (a):
R. F. Janecek. letter to Director of Nuclear. Reactor Regulation dated September 2, 1980 (b):
T. A.
Ippolito letter to J. S. Abel dated November 5, 1980
Dear Mr. Denton:
Pursuant to 10 CFR 50.59, Commonwealth Edison Co. proposes to amend Appendix A, Technical Specifications, to Facility Operating License DPR-30 for Quad Cities Unit 2.
The proposed changes would
. correct a discrephncy between RPS delay and response times specified in the Technical Specification and those used in the licensing analyses and would provide for the use of APRM gain adjustments in lieu of APRM trip setpoint changes for periods of higher than normal power peaking.
The upper limit of the reactor protection system (RPS) delay time has been reduced from 100 to 50 msec (time from opening of the sensor contact up to and including the opening of the trip actuator contacts).
This change stems from an inconsistency which has existed between the Technical Specification value of 100 msec and the 50 msec value assumed by General Electric in the licensing analyses.
General Electric has confirmed that the Edison procedures for determining RPS delay time are consistent with their use/ definition of a 50 msec RPS delay time in the licensing analyses.
The licensing analyses are also based on a value of 290 msec for the time the neutron sensor reaches the setpoint to the start of control rod motion.
The value of 390 msec currently quoted in.the Quad Cities Unit 1 Technical Specifications is inconsistent with this value, and is therefore revised j
THIS DOCUMENT CONTAINS l
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POOR QUAUTY PAGES
i 4 Also, these proposed Technical Specifications provide for
.... increasing the APRM gains in lieu of an actual reduction in APRM trip. set points whenever the MFLPD exceeds the FRP. -This method establishes an initial APRM signal closer to the flow-biased setpoints, and thus-has the same effect as reducing the actual scram
-and rod block setpoints.
For consistency with the LHGR surveillance requirement and the Standardized Technical Specifications, the proposed changes also require that the-FRP/MFLPD multiplier be applicable only above 25% rated thermal power.
These proposed changes are identified in Enclosure 1 and have received On-Site-and Off-Site review and approval.
Pursuant to 10 CFR 170, Commonwealth Edison has reviewed the proposed changes relative to their fee class.
Since.the RPS delay' time change merely corrects the Technical Specifications to agree with the current analyses, we have concluded that it is a Class II. Amendment.
The APRM gain change has been determined to be a Class III Amendment.
As such, a fee remittance in the amount of
. $5,200.00 has been provided.
However, in as much as identical changes were submitted and approved previouly for Quad Cities Unit 1 (References.(a) and (b)), both changes may more appropriately be considered as Class I.
Please review the proposed changes with regard to their applicability as Class I amendments and any fee reduction which may apply.
Please address any questions concerning this matter.to this office.
Three (3) signed originals and thirty-seven (37) copies of this transmittal are provided for your use.
Very truly yours, Robert F. Janecek Nuclear Licensing Administrator Boiling Water Reactors cc:
RIII Inspector - Quad Cities SUBSCRIBED and SWO N to before e this-
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Notary Puolic-1983N