ML20045B870
| ML20045B870 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 06/16/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20045B871 | List: |
| References | |
| NUDOCS 9306210198 | |
| Download: ML20045B870 (2) | |
Text
+
y f.
The isolation valves in the discharge header of the high head I
safety injection system are in the open position, g.
All valves, interlocks, and piping associated with the above components and required to function during accident conditions a e operable.
h.
During conditions of operation with reactor coolant
,;,v orer are in excess of 1,000 psig, the source of AC power sha
r av<d from the accumulator isolation valves MOV-841A and E He.er s ar control center and the valves shall be open, i.
Power may be restored to MOV-841A and B for the purpose of velve testing or maintenance providing the testing and maintenance is completed and power is removed within four hours.
2.
During power operation, the requirements of 15.3.3.A.1, Items b anc.,
may be modified to allow one of each of the following components to se inoperable at any one time.
If the system is not restored to meet the requirements of 15.3.3.A.1 within the time period specified, the reactor shall be placed in the hot shutdown condition.
If the require-mer.ts of 15.3.3.A.1 are not satisfied within an additional 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, the reactor shall be placed in the cold shutdown condition, a.
One accumulator may be isolated to perform a check valve leakage test or be otherwise inoperable for a period of up to one hour.
Before isolating an accumulator, the other accumulator isolation valve shall be checked open.
b.
One safety injection pump may be out of service, provided the pump is restored to operable status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
The other safety injection pump shall be operable.
c.
Any valve in these systems required to function during accident conditions may be inoperable provided repairs are completed within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Prior to initiating repairs, all valves in the system that provide the duplicate function shall be operable.
3.
During power operation, the requirements of 15.3.3.A.1, Items d and e, may be modified to allow one of each of the following components to be inoperable at any one time.
If the component is not restored to meet Unit 1 Amendment gg,y78,139 15.3.3-2 t
Unit 2 Amendment JJ, l'f,143 9306210198 930616 PDR ADDCK 05000266 P
t 8
The operable status of the various systems and components is to be demonstrated by periodic tests, defined by Specification 15.4.5.
A large fraction of these tests will be performed while the reactor is operating in the power range.
If a component is found to be inoperable it will be possible in most cases to effect repairs and restore the system to full operability within a relatively thort time.
For a single component to be inoperable does not negate the ability of the system to perform its function, but it reduces the redundancy provided in the reactor design and therr$y limits the ability to tolerate additional equipment failures.
If it deve aps that (a) the inoperable component is not repaired within the specified allowable time period or (b) a second component in the same or related syste is found to be inoperable, the reactor will initially be put in the hot shutdown condition to provide for reduction of the decay heat from the fuel, and consequent reduction of cooling requirements after a postulated loss-of-coolant accident.
This will also permit improved access for repairs in some cases. After a limited time in hot shutdown, if the malfunction (s) are not corrected, the reactor will be placed in the cold shutdown condition, utilizing normal shutdown and cooldown procedures.
For example, specification 15.3.3.A.2.a allows one accumulator to be isolated or otherwise inoper 51e for periods of up to one hour.
An inoperable accumulator may be defined as one with its outlet MOV shut, no pressure instrumentation operable, or water and/or nitrogen spaces cross-connected with the accumulator on the other loop.
If the inoperable accumulator is not restored within one hour then the conditions of specification 15.3.0.A and 15.3.0.B apply which requires the affected unit, if critical, to be in hot shutdown within three hours and in cold shutdown within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> if the condition is not corrected.
In the cold shutdown condition there is no possibility of an accident that would release fission products or damage the fuel elements.
The specified repair times do not apply to regularly scheduled maintenance of the engineered safety systems, which is normally to be performed during refueling shutdowns. The limiting times to repair are based on:
1)
Assuring with high reliability that the safety system will function properly if required to do so.
2)
Allowances of sufficient time to effect repairs using safe and proper procedures.
Amendment No. Ab8,139 i
Amendment No. A42,143 15.3.3.-7
- -