ML20248B399
| ML20248B399 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 09/25/1989 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20248B396 | List: |
| References | |
| NUDOCS 8910030184 | |
| Download: ML20248B399 (8) | |
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ATTACHMENT-1 Il0EJUCLEARIORER STATI_QN PROPOSED CHANGES TO APPENDIX A IEQiNlCAL_SPECIFICATIQB SECTION 3.9.
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ATTACHtiENT 2 ZION NUfLEAR POWER STATION PROPOSED TECHNICAL SPECIFICATION AMENDMENT TO SECTION 3.9/4.9 EVALUATION OF SIGNIFICANT HAZARDS CONSIDERATION i
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F ATTACHMENI_2 ZION NUCLEAR POWER STATION EVALUATION OF SIGNIFICANT HAZARDS CONSIDERATION 120EQSED_QLMES TO APPENDIX A JECHHlCAL SPECIFICATION
.SECTION 3.9
[0BJAl}lMENT ISQL611DN
. Description of Amendment Renugit An Amendment to the Zion Facility Operating License is. proposed to include restriction on containment purge and vent operations. The purge valves will be limited to a 50 degrees valve opening and shall only be opened for the following safety-related reasons: (1) For Containment pressure control when the Pressure / Vacuum Relief. System is inoperable, or (2) For Containment temperature control when all available Reactor Containment Fan Coolers are unable to maintain temperature less than the Technical Specification limit of less than 1200F, (3) For containment atmosphere cleanup to allow for personnel entry for inspection, tests and/or. maintenance activities, or, (4) For Containment explosive gas removal.
In addition, the Containment pressure and vacuum relief line shall be isolated whenever the Containment purge line is open, and shall only be opened for the following saftty-related reasons: (1) Prior to opening the purge supply and exhaust isolation valve, or, (2) For Containment pressure / vacuum relief, or, (3) For Containment explosive gas removal.
10 CFR 50.92 states that a proposed amendment will involve a no significant hazards consideration if the proposed amendment does not:
- 1. Involve a significant increase in the probability or consequences of an accident previously evaluated; or
- 2. Create the possibility of a new or different kind of accident from any accident previously evaluated; or
- 3. Involve a significant reduction in a margin of safety.
In addition, the Commission has provided guidance in the practical application of these criteria by publishing eight examples in 48'FR 14870.
The discussion below addresses each of these three criteria and demonstrates that the proposed amendment involves a no significant hazards consideration.
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AUACHMElli 2 3 cod _tlDundl BASIS FOR NQ_SIGNIFICANT HAZARQSJONSIDERATIQH_ DETERMINATION Does the' proposed amendment
- 1. Involve a significant increase in the probability or consequences of an accident previously evaluated; or
- 2. Create the possibility of a new or different kind of accident from any accident previously evaluated; or
- 3. Involve a significant reduction in a margin of safety?
DISCUSSION - ITEM #1 The imposition of these restrictions results in more conservative operation than was previously allowed by the Zion Technical Specifications.
The 50 degree maximum opening limit results in more reliable containment isolation than a full open valve. Thus, the excessive release of radioactive material following a postulated LOCA is less likely with the valve opening limited'to 50 degrees.
The imposition of tighter controls over the purge and vent operations to require that these valves shall only be opened for safety-related reasons provides for more conservative operation of this system and thus reduces the consequences of previously evaluated accidents and does not affect the probability of any previously evaluated accident.
ELSCUSSION - ITEM #2 As discussed above, the proposed amendment will impose tighter restrictions on purge and vent operations than the existing Technical Specifications. Thus, the imposition of limits on purge valve position and a requirement to limit both purge'and vent operations will result in more conservative operation and will not create the possibility of a new or different kind of accident.
RISCUSSLON - ITItLD l The imposition of the more conservative limits on purge valve position and the requirement to limit purge and vent operations will increase the margin of safety. As discussed above, these new restrictions'will reduce the likelihood of an excessive release of radioactive materials following a postulated LOCA. Thus, the margin of safety will not be adversely.affected.
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ATTACHMENT 2 (continued)
' Note that the proposed amendment meets and exceeds the example (ii) of.the Commission guidance provided in 48 FR 14870.
(11) A change that constitutes an additional l limitation, restriction, or control not presently included in the Technical Specifications:
for example, a more stringent surveillance requirement.
Therefore, since the application for amendment satisfies the criteria specified,in 10 CFR 50.92 and is similar to examples for which no significant hazards consideration exists, Commonwealth Edison Company has made a-determination that the application involves no significant hazards consideration.
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