ML022880122
| ML022880122 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 10/10/2002 |
| From: | NRC/NRR/DLPM |
| To: | |
| References | |
| TAC MB5488, TAC MB5489 | |
| Download: ML022880122 (2) | |
Text
REFUELING OPERATIONS DECAY TIME LIMITING CONDITION FOR OPERATION 3.9.3 The reactor shall be subcritical for at least:.
- a.
100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> - Applicable through year 2010.
- b.
168 hours0.00194 days <br />0.0467 hours <br />2.777778e-4 weeks <br />6.3924e-5 months <br /> APPLICABILITY:
Specification 3.9.3.a -
From October 15ý" through May 15th, during movement of irradiated fuel in the reactor pressure vessel.
Specification 3.9.3.b From May 16.'
through October 14 t, during movement of irradiated fuel in the reactor pressure vessel.
ACTION:
With the reactor subcritical for less than the required time, suspend all operations involving movement of irradiated fuel in the reactor pressure vessel. The provisions of Specification 3.0.3 are not applicable.
SURVEILLANCE REQUIREMENTS 4.9.3 The reactor shall be determined to have been subcritical as required by verification of the date and time of subcriticality prior to movement of irradiated fuel in the reactor pressure vessel.
Amendment No. 251 3/4 9-3 SALEM - UNIT 1
3/4.9 REFUELING OPERATIONS BASES 3/4.9.1 BORON CONCENTRATION The limitations on minimum boron concentration (2000 ppm) ensure that:
- 1) the reactor will remain subcritical during CORE ALTERATIONS, and 2) a uniform boron concentration is maintained for reactivity control in the water volume having direct access to the reactor vessel.
The limitation on Keff of no greater than 0.95 which includes a
conservative allowance for uncertainties, is sufficient to prevent reactor criticality during refueling operations.
The sampling and analysis required by surveillance requirement 4.9.1.2 ensures the boron concentration required by Limiting Condition of Operation 3.9.1 is met.
Sampling and analysis of the refueling canal is required if water exists in the refueling
- canal, regardless of the amount.
3/4.9.2 INSTRUMENTATION The OPERABILITY of the source range neutron flux monitors ensures that redundant monitoring capability is available to detect changes in the reactivity condition of the core.
3/4.9.3 DECAY TIME The minimum requirement for reactor subcriticality prior to movement of irradiated fuel assemblies in the reactor pressure vessel ensures that sufficient time has elapsed to allow the radioactive decay of the short lived fission products.
The 100-hour decay time is consistent with the assumptions used in the fuel handling accident analyses and the resulting dose calculations using the Alternative Source Term described in Reg. Guide 1.183.
The minimum requirement for reactor subcriticality also ensures that the decay time is consistent with that assumed in the Spent Fuel Pool cooling analysis.
Delaware River water average temperature between October 1 5 th and May 1 5 th is determined from historical data taken over 30 years.
The use of 30 years of data to select maximum temperature is consistent with Reg.
Guide 1.27, "Ultimate Heat Sink for Nuclear Power Plants".
A core offload has the potential to occur during both applicability time frames.
In order not to exceed the analyzed Spent Fuel Pool cooling capability to maintain the water temperature below 180 0 F, two decay time limits are provided.
In
- addition, PSEG has developed and implemented a Spent Fuel Pool Integrated Decay Heat Management Program as part of the Salem Outage Risk Assessment.
This program requires a
pre-outage assessment of the Spent Fuel Pool heat loads and heatup rates to assure available Spent Fuel Pool cooling capability prior to offloading fuel.
Amendment No.
251 B 3/4 9-3 SALEM - UNIT 1