ML17146A917
| ML17146A917 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 08/17/1987 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17146A916 | List: |
| References | |
| NUDOCS 8708260390 | |
| Download: ML17146A917 (6) | |
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UNITED STATES NUCLEAR REGULATORY.COMMISSION WASHINGTON, D. C. 20555 SAFETY EVALUATION BY THE OFFICE OF HUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 68 TO FACILITY OPERATING LICENSE NO.
NPF-14 PENNSYLVANIA POWER 5 LIGHT COMPANY ALLEGHENY ELECTRIC COOPERATIVE, IHC.
DOCKET NO. 50-387 SUSQUEHANNA STEAM ELECTRIC STATION, UNIT 1
- 1. 0 INTRODUCTIOH By letter dated December 9, 1986, Pennsylvania Power 8 Light Company requested an amendment to Facility Operating License No.
HPF-14 for the Susquehanna Steam Electric Station (SSES),
Unit 1.
The proposed amendment would revise the
- SSES, Unit 1 Technical Specifications to support modifications which would improve the containment isolation function and the testability of the feedwater system.
Specifically, the proposed changes consist of; (1) a change to Table 3.6.3-1 (Primary Containment Isolation Valves) replacing two reactor water cleanup (RWCU) manual isolation valves with two new gate valves.
The valves being replaced (HV-144F042 and HV-144F104) are not being removed from the plant, but will not serve as containment isolation valves; and (2) two new containment isolation valves, HV-14182ASB, are being added to the list of valves in Table 3.8.4.2-1 (Motor-Operated Valves Thermal Overload Protection).
These valves are equipped with thermal overload bypass circuitry.
The licensee, by a letter dated April 4, 1986, requested an identical change for SSES Unit No. 2.
The Commission approved that request in Amendment No.
28 to Facility Operating License No. NPF-22, dated August 27, 1986.
- 2. 0 EVALUATION As stated
- above, the changes proposed by the licensee from SSES Unit No.
1 are identical to changes approved by the staff for SSES Unit No.
2 in Amendment No. 28.
In that Amendment the staff found the proposed changes acceptable for the following reasons.
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1.. The new manual isolation valves HV-14182ASB are gate valves and will provide improved long term leakage control capability for the RWCU system in comparison with the previously existing globe valves HV-144F042 and HV-144F104.
2.
The new valves will be remote manually operated from the control room like the existing valves.
3.
The new gate valves will be located downstream of the check valves G33-1F039ASB, and will be closer to the containment than the existing globe valves.
This will eliminate long piping run between the test point and the valve in each branch connection to the feedwater penetration and consequently will improve the leak testability of the feedwater system.
4.
The addition of two new gate valves will not alter the present function of instantaneous reverse flow isolation provided by the check valves mentioned above.
Therefore, two barriers, i.e., the check valve and the new manual isolation'alve w'ill continue to be available for performing the isolation of each branch connection of the RWCU system return line to the feedwater penetration, as present in the previous design.
5.
The safety-related function of the existing feedwater isolation valves for the feedwater lines as approved in Susquehanna, Units 1 and 2, Safety Evaluation Report Section 6.2.4.1, dated April 1981, will not be altered by the proposed addition of the two aforementioned valves.
6.
The new valves will be equipped with thermal overload bypass circuits and thus are protected against possible thermal overloads.
These valves have been added to Table 3.8.4.2-1.
These valves also receive emergency power. from the diesel generators.
The additional load to the diesels has been incorporated in the plant design.
Based on the above, the staff concludes that the proposed changes to Tables 3.6.3-1 and 3.8.4.2-1 of the Unit 1 Technical Specifications are acceptable.
Our acceptance is based on our findings that the design changes associated with the Technical Specifications changes will: I) improve. the containment isolation function and the testability of the feedwater penetration during local leak rate testing,
- 2) continue to provide dual barriers for the RWCU return lines as previously available,
- 3) retain the existing throttling function of the RWCU flow as appropriate to support the RWCU operation, and 4) protect the new motor-operated manual isolation valves against possible thermal overload.
- 3. 0 ENVIRONHENTAL CONSIDERATION This amendment involves changes to requirements with respect to the instal-lation or use of facility components located within the restricted area as defined in IO CFR Part 20.
The staff has determined that the amendment involves no significant increase in the. amounts, and no significant change in
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1 the types, of any effluents that may be released offsite and that there is no significant increase in individual or cumulative occupational radiation exposure.
The Commission has previously issued a proposed finding that this amendment involves no significant hazards consideration and there has been no public comment on suck finding.
Accordingly, this amendment meets the eligibi-lity criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b) no environmental impact statement nor environmental assessment need be prepared in connection with the issuance of this amendment.
4.0 CONCLVSION The Commission made a proposed determination that the amendment involves no significant hazards consideration which was published in the Federal Re ister (52 FR 26592} on July 15, 1987 and consulted with the State o7 Pennsy van>a.
No public comments were received, and the State of Pennsylvania did not have any coments.
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, and (2) such activities will'e conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the common defense and security nor to the health and safety of the public.
Principal Contributor:
Mohan C. Thadani Dated:
August 179 1987
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