ML20148E336
| ML20148E336 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 01/19/1988 |
| From: | NRC OFFICE OF SPECIAL PROJECTS |
| To: | |
| Shared Package | |
| ML20148E317 | List: |
| References | |
| TAC-R00031, TAC-R00032, TAC-R00033, TAC-R31, TAC-R32, TAC-R33, NUDOCS 8801260009 | |
| Download: ML20148E336 (2) | |
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION W ASHINGT ON. D C. 20555
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SAFETY EVALUATION BY THE OFFICE OF SPECI AL PROJECTS SUPPORTING AFENDMENT NO.140 TO FACILITY OPERATING LICENSE NO. OPR-33 alien 0HENT NO.136 TO FACILITY OPERATING LICENSE NO. DPR-52 APENDMENT N0.111 TO FACILITY OPERATING LICENSE NO. DPR-68 TENNESSEE VALLEY AUTHORITY BROUNS FERRY NUCLEAR PLANT, LTITS 1, 2 AND 3 DOCKETS N05. 50-259, (0-260 AND 50-296 P
1.0 INTRODUCTION
The proposed amendments would clarify the trip level setting for the standby gas treatment system (SGTS) relative humidity (R.H.) heater.
The current requirement of "less than or equal to 2000 cfn" is changed to be "greater than or equal to 2000 cfm and less than or equal to 4000 cfm".
2.0 EVALUATION In the current Technical Specification (TS) a contradiction exists between the trip level setting column and the remarks column of lable 3.2.A for the instrument that trips the SGTS R.H. heater on icw ficw. The trip level setting column reccires the actual trip point to be below 2000 cfm.
Since the purpose of the switch is to protect the system from overheating if air flow is lost, the remarks colcr.n is correct and the setpoint column must be changed to be consistent with it.
The intent cf the TS requirement in Table 3.2.A for the R.H. heater switch is to turn off the heater before a decreasine SCTS flow reaches 2000 cfm.
This would prevent damage to the SGTS filter banks by turning off the R.H. heaters.
A literal reading of the current TS wording would allcw a setpoint of 0 cfm which does not fulfill the intent of the TS.
Therefore, the "less than er equal to" requirement should be changed to "greater than or equal to" in order to treet the intent of the TS and achieve agreement with the design basis An upper trund of 4000 cfm is imposed on the setpoint to ensure that the flow switches do not prevent the heaters from performing their function during normal biwer operation.
TS 3.7.B.2.c requires that each train operate within 10 percent of design ficw (9000 cfm). Therefore, when the system is initiated, 2
the airflow for an operable train would be greater than 4000 cfm and the heaters would perform their function.
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$.d th the c esign basi s er d +re inal Sa fety A r aly si s keL c'*
and, there# ;re, wil ncrease
+>e margi-t-sa'e+.
i i fur *her review c' tre gr pcsec change to tr e r era rk; tc ' urrn o'*b.
2 able 2.A, the staff ' clod there was nn+ a s pec "'ic setpc ir
- where the 4aters were rer;u"red tc te s*ut o" The current 3 N.te such a se L: 1nt
- discussict w'tr Yr.
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- was agrec c upon tha t cic ri fica + it r s c.
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- h e m i n i rr r ~ ' cw ra+n wFere R.H. ne6ters cou d !t' 0; erat.
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H. heaters shal t e S t u t 0". '
sed cn the abcvc esaluatie erd the cl ?r,'icaticr tc
'$, the s+c " #incs tr e r
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