ML20247F851
| ML20247F851 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 03/30/1989 |
| From: | WOLF CREEK NUCLEAR OPERATING CORP. |
| To: | |
| Shared Package | |
| ML20247F847 | List: |
| References | |
| NUDOCS 8904040059 | |
| Download: ML20247F851 (3) | |
Text
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1 ATTACHMENT III PROPOSED TECHNICAL SPECIFICATION CHANGES i
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Attachment III to WM 89-0096 Page 1 of1!
PLANT SYSTEMS STEAM GENERATOR ATMOSPHERIC RELIEF VA'.
LIMITING CONDITION OF OPERATION l
3.7.1.6 At least three steae generator atmopsheric relief valves (ARV's) shall be OPERABLE.
APPLICABILITY: Modes 1, 2, and 3.
ACTION:
a.
With one of the required ARV's inoperable due to causes other than excessive seat leakage, within 7 days restore the ARV to OPERABLE status, or be in HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
b.
With more than one of the required ARV's inoperable due to causes other than excessive seat leakage, within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> restore at least two of the required ARV's to OPERABLE etatus or be in HOT STAND 8Y within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
c.
With one or more of the required ARV's inoperable because of excessive seat leakage, close the associated block valve (s) within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and restore the ARV to OPERABLE within 30 days, or be in HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
d.
The provisions of Specification 3.0.4 are not applicable.
SURVEILLANCE REQUIREMENTS 4.7.1.6 No additional requirements other than those required by Specification 4.0.5.
l-Attachment III to WM 89-0096 l
Page 2 of 2 PLANT SYSTEMS BASES 3/4.7.1.6 STEAM GENEP.ATOR ATMOSPHERIC RELIEF VALVES The operability of the main steamline atmospheric relief valves (ARV's) ensures that reactor decay heat can be dissipated to the atmopshere in the event of a steam generator tube rupture and loss of offsite power and that the Reactor Coolant System can be cooled down for Residual Heat Removal System operation.
The number of required ARV's assures that the subcooling can be achieved, consistent with the assumptions used in the steam generator tube rupture analysis, to facilitate equalizing pressures between the i
Reactor Coolant System and the faulted steam generator.
For cooling the plant to RHR initiation conditions, only one ARV is required. In this case, with three ARV's operable, if the single failure. of one ARV occurs and another ARV is assumed to be associated with the faulted steam generator, one ARV remains available far required heat removal.
Each ARV is equipped with a manual block valve (in the auxiliary building) to provide a positive shutoff capability should an ARV develop leakage.
Closure of the block valves of all ARV's because of excessive seat leakage does not endanger the reactor core; consistent with plant accident and transient analyses, decay heat can be dissipated with the main steamline safety valves or a block valve can be opened manually in the auxiliary building and the ARV can 1.
used to control release of steam to the at mosphe re.
For the steam generator tube rupture event, primary to secondary leakage can be terminated by depressurizing the Reactor Coolant System with the pressurizer power operated relief valves.
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