ML021060349

TS Pages to Amendment 230

ML021060349
Person / Time
Site:	Hatch
Issue date:	04/11/2002
From:	NRC/NRR/DLPM/LPD2
To:	Southern Nuclear Operating Co
References
TAC MB2976, TAC MB2977
Download: ML021060349 (5)

Text

PCIVs 3.6.1.3 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.6.1.3.6 Verify the isolation time of each MSIV is In accordance

Ž 3 seconds and

• 5 seconds. with the Inservice Testing Program SR 3.6.1.3.7 Verify each automatic PCIV, excluding 18 months EFCVs, actuates to the isolation position on an actual or simulated isolation signal.

SR 3.6.1.3.8 Verify each reactor instrumentation line 18 months EFCV (of a representative sample) I actuates to restrict flow to within limits.

SR 3.6.1.3.9 Remove and test the explosive squib from 18 months on a each shear isolation valve of the TIP STAGGERED TEST system. BASIS SR 3.6.1.3.10 Verify leakage rate through each MSIV is In accordance

< 11.5 scfh when tested at > 28.0 psig. with the Primary Containment Leakage Rate Testing Program (continued) 3.6-14 Amendment No. 230 HATCH UNIT I

PCIVs B 3.6.1.3 BASES SURVEILLANCE SR 3.6.1.3.8 REQUIREMENTS (continued) This SR requires a demonstration that each reactor instrumentation line excess flow check valve (EFCV) (of a representative sample) is OPERABLE by verifying that the valve reduces flow to within limits on an actual or simulated instrument line break condition. (The representative sample consists of an approximately equal number of EFCVs, such that each EFCV is tested at least once every 10 years [nominal]. In addition, the EFCVs in the sample are representative of the various plant configurations, models, sizes, and operating environments.

This ensures that any potentially common problem with a specific type of application of EFCV is detected at the earliest possible time.) This SR provides assurance that the instrumentation line EFCVs will perform as designed.

The 18 month Frequency is based on the need to perform this Surveillance under the conditions that apply during a plant outage and the potential for an unplanned transient if the Surveillance were performed with the reactor at power.

Operating experience has shown that these components usually pass this Surveillance when performed at the 18 month Frequency. Therefore, the Frequency was concluded to be acceptable from a reliability standpoint. (The nominal 10 year interval is based on performance testing as discussed in NEDO-32977-A, "Excess Flow Check Valve Testing Relaxation" (Ref. 7). Furthermore, any EFCV failures will be evaluated to determine if additional testing in that test interval is warranted to ensure overall reliability is maintained. Operating experience has demonstrated that these components are highly reliable and that failures to isolate are very infrequent. Therefore, testing of a representative sample was concluded to be acceptable from a reliability standpoint.) Any excess flow check valve that fails to check flow during its surveillance test will be documented in the Hatch Corrective action program as a surveillance test failure. The failure will be evaluated and corrected and, if the valve is repaired and not replaced, it will be added to the next cycle's surveillance.

SR 3.6.1.3.9 The TIP shear isolation valves are actuated by explosive charges. An in place functional test is not possible with this design. The explosive squib is removed and tested to (continued)

REVISION 25 HATCH UNIT 1 B 3.6-27

PCIVs B 3.6.1.3 BASES SURVEILLANCE SR 3.6.1.3.9 (continued)

REQUIREMENTS provide assurance that the valves will actuate when required. The replacement charge for the explosive squib shall be from the same manufactured batch as the one fired or from another batch that has been certified by having one of the batch successfully fired. The Frequency of 18 months on a STAGGERED TEST BASIS is considered adequate given the administrative controls on replacement charges and the frequent checks of circuit continuity (SR 3.6.1.3.4).

SR 3.6.1.3.10 The analyses in References 1 and 3 are based on leakage that is less than the specified leakage rate. Leakage through each MSIV must be

• 11.5 scfh when tested at : 28.0 psig.

The Frequency is required by the Primary Containment Leakage Rate Testing Program (Ref. 6).

SR 3.6.1.3.11 The valve seats of each 18 inch purge valve (supply and exhaust) having resilient material seats must be replaced every 18 months. This will allow the opportunity for repair before gross leakage failure develops. The 18 month Frequency is based on engineering judgment and operational experience which shows that gross leakage normally does not occur when the valve seats are replaced on an 18 month Frequency.

SR 3.6.1.3.12 The Surveillance Requirement provides assurance that the excess flow isolation dampers can close following an isolation signal. The 18 month Frequency is based on vendor recommendations and engineering judgment. Operating experience has shown that these dampers usually pass the Surveillance when performed at the 18 month Frequency.

Therefore, the Frequency was concluded to be acceptable from a reliability standpoint.

(conti nued)

B 3.6-28 REVISION 25 HATCH UNIT 1

PCIVs B 3.6.1.3 BASES (continued)

REFERENCES 1. FSAR, Section 14.4.

2. Technical Requirements Manual

3. FSAR, Section 5.2.

4. 10 CFR 50, Appendix J, Option B.

5. NRC No.93-102, "Final Policy Statement on Technical Specification Improvements," July 23, 1993.

6. Primary Containment Leakage Rate Testing Program.

7. NEDO-32977-A, "Excess Flow Check Valve Testing Rel axati on."

HATCH UNIT 1 B 3.6-28a REVISION 25

PCIVs B 3.6.1.3 (This page intentionally left blank)

HATCH UNIT 1 B 3.6-28b REVISION 25