ML20247D671
| ML20247D671 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 09/01/1989 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20247D669 | List: |
| References | |
| NUDOCS 8909150039 | |
| Download: ML20247D671 (3) | |
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.k UNITED STATES o
8, NUCLEAR REGULATORY COMMISSION o
ji j
WASHINGTON, D. C. 20555
- o, SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.39 TO FACILITY OPERATIllG LICENSE NO. NPF-43 DETROIT EDISON COMPANY WOLVERINE POWER SUPPLY COOPERATIVE, INCORPORATED FERMI-2 DOCKET NO. 50-341
1.0 INTRODUCTION
By letter dated January 27, 1988 as supplemented May 10, 1989, the Detroit Edison Company (DECO or the licensee) requested amendment to the Technical Specifications (TSs) appended to Facility Operating License No. NPF-43 for Fermi-2. The proposed amendment.would revise Technical Specifications 3/4.2.3 and 3/4.7.9 and Bases 3/4.2.3 and 3/4.7.9 to clarify the bases of operation with a Moisture Separator Reheater (MSR) out-of-service. Specifically, the amendment would (1) modify Technical Specification 3/4.7.9 by specifying operating limitations of the MSR; (2) demonstrate conservatism to the existing transient analysis and clarify that the limits in Technical Specification i
3/4.2.3, Figure 3.2.3-1 (Curve B), bound the operating scenario for the MSR i
out-of-service; and (3) provide an additional limitation (Curve C) to Technical Specification 3/4.2.3, Figure 3.2.3-1, for the operating scenario of an inoperable main turbine bypass and MSR out-of-service.
2.0 EVALUATION i
i In the Updated Final Safety Analysis (UFSAR) Fermi-2 takes credit for the Moisture Separator Reheater (MSR) in the transient analysis. However, the current Technical Specifications do not indicate or restrict operation with a MSR.out-of-service. The proposed Technical Specifications will allow plant operation with a MSR out-of-service. The proposed change request:
A.
Modifies Technical Specification 3/4.7.9 by specifying operation limitations of the MSR.
B.
Demonstrates conservatism to the existing transient analysis and clarifies that the limits in Technical Specifications 3/4.2.3, Figure 3.2.3.1 (Curve B) bounds the operating scenario for the MSR out-of-service.
C.
Provides an additional limitation (Curve C) to Technical Specification 3.4.2.3, Figure 3.2.3-1 for the operating scenario of an inoperable main turbine bypass and MSR out of service.
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- j The primary purpose of the MSR is to improve cycle efficiency by using primary system steam to heat the high pressure turbine exhaust before it enters the low-pressure turbines.
In doing so, it also provides a passive steam bypass l
flow of about 10 percent that mitigates the early effects of over-pressure transients. MSR is required to be OPERABLE consistent with the assumptions of the Main Turbine Trip with Turbine Bypass Failure analysis and the Feedwater Controller Failure analysis.
The proposed Technical Specification Section 3/4.7.9 adds MSR to the Limiting Conditions of Operation (LCO).
Since Fermi-2 takes credit for MSR in the transient analysis, MSR is included in the LCO. Therefore, the proposed Technical Specification change in 3/4.7.9 and the bases is acceptable.
l The title of 3/4.7.9 on pages 3/4 7-40 and B 3/4 7-5 is changed to " Main Turbine Bypass System and Moisture Separator Reheater" to reflect the actual content of the section.
Technical Specification 3/4.2.3, Figure 3.2.3-1 Curve A provides the Minimum Critical Power Ratio (MCPR) limit assuming operation above 25 percent rated thermal power with both the MSR and main turbine system operable. Hence, the title for Curve-A in Figure 3.2.3-1 is changed to "MCPR Limit with Main Turbine Bypass and Moisture Separator Reheater" to indicate the operating condition with both.
Technical Specification 3/4.2.3, Figure 3.2.3.1, Curve B is based on the l
Feedwater Controller Failure with inoperable Turbine Bypass (26 percent capacity) transient analysis. This analysis bounds the case for MSR l
inoperable when only 10 percent bypass capability is assumed to be lost.
Hence, the present Curve-B is bounding for either the Loss of Turbine Bypass capability or the Loss of MSR. The proposed title for Curve-B applying the Curve-B for situations without Main Turbine Bypass or without Moisture Separator Reheater is acceptable.
The proposed Curve-C in Figure 3.2.3.1 provides the MCPR Limit with both the Turbine Bypass and MSR inoperable. The curve was developed based upon the Limiting Feedwater Controller Failure with no Steam Flow Bypass through Turbine Bypass or MSR. The calculated MCPR 1.28 for this scenario is sufficiently higher than the MCPR Safcty Limit of 1.06.
The staff finds this acceptable.
The Feedwater Controller Failure Analysis described above was performed with the-same approved models used in the FSAR. The staff finds this acceptable.
Based on the evaluation the staff finds the proposed changes in Technical Sp w fication Sections 3/4.2.3,3/4.7.9 Figure 3.2.3-1 bases for 3/4.2.3 and 3/4.7.9 are acceptable as stated above.
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.t; 3.0 ~ ENVIRONMENTAL CONSIDERATION.
p Pursuant'to 10.CFR 51.21,-51.32 and 51.35, an environmental assessment and-
, finding of.no significant. impact have.been prepared and published in the,
Accordingly, based upon j
Federal. Register on August 31,1989-(54 FR 36069)that the issuance.of +.his j
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'the environmental assessment, we have determined
' amendment will not have'a significant effect on the quality of the human-1 environment.
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-4.0. CONCLUSION ~
..Wehave: concluded,basedon.theconsiderationsdiscussedabove,that(1) there is reasonable assurance that the health and safety of the public wi'11
.not be endangeredLby operation in' the proposed anner, and (2) ruch activities m
.will be conducted in' compliance with the Commfssion's_ regulations,.and the L
issuance of this? amendment will not-be inimical to the common defense and'
-security or to the health and safety of the public.
Principal l Contributor:
.G.' Thomas Date: September l',1989
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