ML18051B359
| ML18051B359 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 04/30/1985 |
| From: | CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| Shared Package | |
| ML18051B357 | List: |
| References | |
| NUDOCS 8505070136 | |
| Download: ML18051B359 (3) | |
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ATTACHMENT Consumers Power Company Palisades Plant Docket 50-255 PROPOSED TECHNICAL SPECIFICATION PAGE CHANGES April 30, 1985 8505070136 850430 l
PDR ADOCK 05000255 '
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PDR I
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2 Pages IC0485-0184B-NL04
3.1 PRIMARY COOLANT SYSTEM (Contd) 3.1. 5 Basis Primary Coolant System Leakage Limits Specifications
- a.
If the primary coolant system leakage exceeds 1 gpm and the source of the leakage is not identified, reduce unidentified primary coolant system leakage to less than 1 gpm within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, or place the reactor in hot shutdown condition within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown condition within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
- b.
If leakage from the primary coolant system exceeds 10 gpm, reduce primary coolant system leakage to less than 10 gpm within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, or place the reactor in hot shutdown condition within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown condition within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
- c. If the specific activity of the secondary coolant in a steam generator exceeds 0.1 µCi/gram dose equivalent I-131, the reactor shall be placed in hot shutdown within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown within i?ie following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
- d.
The primary to secondary leakage in a steam generator shall not exceed 0.3 gpm for any period of steady state operation greater than 24 consecutive hours.
During periods of start-up and major load changes, when the leakage measurement sensitivity is reduced, the calculated leakage shall not exceed 0.6 gpm for any period of greater than 24 consecutive hours.
- e.
(Deleted)
"Industry experience has shown that while a limited amount of leakage is expected from the primary coolant system, the unidentified portion of this leakage can be reduced to a threshold value of less than 1 gpm.
This threshold value is sufficiently low to ensure early detection of additional leakage.
When the source of the leakage can be identified, the condition shall be evaluated to determine if operation can safety continue.
Justification for continued operation with identified leakage in excess of 1 gpm shall be documented in writing and approved by the Plant General Manager or his representative."
A maximum allowable primary coolant system leak rate of 10 gpm has been established.
This limitation does not include the primary coolant pump seal leak-off which is directed to the volume control tank.
The 10 gpm limitation provides allowances for a limited amount of leakage from known sources whose presence will not interfere with the detection of unidentified leakage.
A primary coolant system leak rate in excess of 10 gpm is indicative of a 3-~20 Proposed TS0485-0184D-NL04
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Q 3.1 5 Primary Coolant System Leakage Limits Basis (Contd) failure of sufficient magnitude to warrant shutdown for repair.
The 10 gpm limitation is well within the 40 gpm capacity of one charging pump which would be available even under a loss of off-site power condition.
The initial 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> period following indication of unidentified primary coolant system leakage in excess of l gpm, or total primary coolant system leakage in excess of 10 gpm, provides sufficient time to facilitate identification and confirmation of the leakage source with the Plant being maintained in a stable condition.
When the source of the leakage cannot be identified or reduced, the following 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> period is sufficient to bring the Plant to hot shutdown condition in an orderly fashion.
The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period which follows provides adequate time to bring the Plant to cold shutdown condition in an orderly fashion and to correct minor deficiencies.
If major repairs are necessary, a cold shutdown condition would be in order.
The limitations on secondary system specific activity ensure that the resultant off-site radiation dose will be limited to a small fraction of 10 CFR Part 100 limits in the event of a steam line rupture.
This dose also includes the effects of a coincident 1.0 gpm primary to secondary tube leak in the steam generator of the affected steam line and a concurrent loss of offsite electrical power."
3-21 Proposed TS0485-0184D-NL04