ML19344B284
| ML19344B284 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 08/22/1980 |
| From: | Crouse R TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19344B283 | List: |
| References | |
| NUDOCS 8008260248 | |
| Download: ML19344B284 (2) | |
Text
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.. s Docket No. 50-5t.u License No. NPF-3 Serial No. 644 August 22, 1980 APPLICATION FOR AMENDMENT TO FACILITY OPERATING LICENSE NO. NPF-3 FOR DAVIS-BESSE NUCLEAR POWER STATION UNIT NO. 1 Enclosed are forty-three (43) copies of the ree' ested change to the Davis-Besse Nuclear Power Station Unit No. 1 Facility Operating License No. NPF-3, together with the Safety Evaluation for the requested change.
The proposed change modifies Table 3.6-2 of the Davis-Besse Unit No. 1 Technical Specifications.
By Nucidar SeEvices Director, Nuclear Services For R. P. Crouse Vice President, Nuclear Sworn to and subscribed before me this twenty second day of August, 1980 6, l'8 Notarypublic 3ERRY E, tNYART pcNT pusuc - state or o.us
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f Docket No. 50-346 License No. NPF-3 Serial No. 644 August 22, B 80 Safety Evaluation This license amendment request provides for modifying Technical Specification (TS) table 3.6-2 for the Containment Purge and Exhaust Isolation valves. With any of the isolation valves in Table 3.6-2 inoperable, entry into the corresponding action statement is m;de.
If the Limiting Condition for Operation is met with reliance on prc., ssions in this action statement (parts b and c), the requirements of Technical Specification 3.0.4 prohibit entry into operational modes.
Thus, for example, with a containment isolation valve inoperable in mode 4, entry into mode 3 and up is pro-hibited if actions b and c of T5 3.6.3.1 are relied upon.
On the other hand,1f valve operability can not be restored within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and actions b and c are not relied upon, the unit has to be eventually placed in mode 5 and entry into higher modes is not possible without restoring valve operability.
The above is an excessive requirement for the Containment Purge and Exhaust isolation valves (CV5005, CV5006, CV5007 and CV5008) listed in'Section B of Table 3.6-2.
This is because in the case of inoperability of a containment purge and exhaust isolation valve, if actions b or c of TS 3.6.3.1 are followed, the affected penetra-tion is required to be isolated within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
It is emphasized that the operability of these valvas ensures that the containment atmosphere will be isolated from the outside environment in the event of a release of radioactive material to the containment atmosphere.
Thus, if actions b or c are followed, the affected penetra-tion is to be isolated and.therefore the operability of these valves to ensure closing during high radiation inside containm9nt is no longer required.
Should a high radiation condition develop, the contcinment purge and/or exhaust isolation path would already have been isolated and the response time criteria in the technical specification (3.6.3.1) vill be met.
This will ensure that the release of radio-active material to the environment will be consistent with the assumptions used in LOCA analyses.
Thus the imposition of TS 3.0.4 on these valves can be eliminated.
Pursuant to the above, it is concluded that this is not an unreviewed safety question.
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