ML20042F069
| ML20042F069 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 05/01/1990 |
| From: | Stols R COMMONWEALTH EDISON CO. |
| To: | Murley T Office of Nuclear Reactor Regulation |
| References | |
| 0876T, 876T, GL-83-28, NUDOCS 9005070182 | |
| Download: ML20042F069 (2) | |
Text
.
f....o
[
) 1400 Oput Place Commomwealth Ed6 son r
4 J Donners Cnve, Illinois 60$15 C
'd May 1, 1990
+
Dr. Thomas E. Murley, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555 l
l
Subject:
Quad Cities Units 1 and 2
(
Generic Letter 83-28: Item 4.5.3 NRC_DockeLNasuM:25 ALM:265 Referencet (a) Generic Letter 83-288 D.0, Eisenhut letter to all OLs and cps dated July 8,1983.
i (b) Letter f rom G.L. Alexander to H.R. Denton dated August 23, 1985.
Dr. Murley:
Reference (b) provided information to the NRC with respect to Item 4.5.3 of Generic Letter 83-28.
In reference (b), Commonwealth Edison stated that NEDO 30844 is applicable to Dresden and Quad Cities.
Subsequently, the NRC Staff requested a more definitive endorsement of NEDC 30844 "BWR Owner's Group Response to NRC Generic Letter 83-28 Item 4.5.3".
Attached is our response endorsing the conclusion of the study.
Please direct any questions you may have to this office.
Very truly yours, R. Stols Nuclear Licensing Administrator cc: L. 01shan, Project Manager-NRR A. Bert Davis, Regional Administrator-RIII Senior Resident Inspector, Quad Cities
/Imw:0876T 0
9005070182 900501 g
ADOCK0500ggg4 PDR P
y l
ATIACMENT 1
Item 4.5.3 of Generic Letter 83-28 requested that licensees review existing RPS on-line functional test intervals required by Technical Specifications to assure a high Reactor Protection System (RPS) reliability.
In January, 1985, the BWR Owners Group submitted NEDC 30844 entitled "BWR Owner's Group Response to Generic Letter 83-28. Item 4.5.3.
The generic report addressed the availability of RPS, the uncertainties, reduced redundancy during test or repair, operator errors and component wear out.
Subsequently, NEDC 30851P was issued in May,1985 which used the base case results form NEDC 30844 to establish a basis for extending the current RPS on-line test intervals and allowed out of service times. NEDC 30851P also provides additional analyses of various known different RPS configuration to support the application of the generic bases on the plant specific basis.
NEDC 30844 and NEDC 30851P utilized reliability analyses with fault tree modeling to estimate RPS failure frequency.
In order to apply these generic reports to any particular plant, each utility was to perform a verification report with plant specific interpretations of the generic analysis.
This evaluation is reported in MDE-90-0485 and MDE-91-0485 (GE proprietary documents) for Quad Cities Units 1 and 2 respectively.
The results of the evaluation indicated that the RPS configuration for Quad Cities Units 1 and 2 has several differences when compared to the RPS configuratien in the generic evaluations; however, the analysis re, ported in NEDC 308511 shows that these differences would not significantly affect the improvement in plant safety due to the-changes in the technical specification based on the generic analyses.
Commonwealth Edison thereby enderses the two NEDO generic evaluations and the Quad Cities specific evaluation of RPS reliability described above.
t-
/0876T L
P