ML20087K651
| ML20087K651 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 08/22/1995 |
| From: | Burski R ENTERGY OPERATIONS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| W3F1-95-0133, W3F1-95-133, NUDOCS 9508240066 | |
| Download: ML20087K651 (2) | |
Text
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t August 22, 1995 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C.
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Subject:
Waterford 3 SES Docket No. 50-382 License No. NPF-38 Request for Additional Information Regarding Technical Specification Change Request NPF-38-154 Gentlemen:
By letter dated June 22, 1994, Waterford 3 proposed a change to the Technical Specifications (TS) Table 3.3-6 item 2b.
The proposed, change replaced the generic Control Room Outside Air Intake (CROAI) radiation monitor alarm / trip setpoint of s 2x BACKGROUND with a set value of s 4.09 x 10-5 uti/cc (micro curies per cubic centimeter).
The purpose of the change is to reduce unplanned actuations of the Engineered Safety Feature (ESF) portion of the Control Room Ventilation System due to tripping of the CROAI monitors as a result of electronic noise.
The proposed setpoint is based on Waterford 3 site specific setpoint calculation HP-CALC-93-004, which was provided to the staff by letter W3F1-95-0098, dated June 28, 1995. The calculation established an alarm / trip setpoint based on preventing radioactive material concentrations in the Control Room exceeding the Derived Air Concentration (DAC) occupational values listed in 10CFR20, Appendix B, Table 1, Column 3.
During a July 17, 1995 telephone discussion of this matter with the staff technical reviewer, a' consensus was reached to incorporate a CROAI monitor alarm / trip setpoint L
value into the TS that is higher than the electronic noise previously observed, yet lower-than the maximum calculated value established in HP-CALC-93-004.
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.Requestdor Additional Information Regarding Technical Specification Change
-Request NPF-38-154 W3F1-95-0133 Page 2 August 22, 1995
'The.previously proposed setpoint value of s 4.09 x 10-5 uCi/cc is' derived from the maximum value (5.45 x 10-5 uCi/cc) established-in HP-CALC-93-004-with a 25 percent adjustment factor applied to account for uncertainty and
' drift. The new proposed value is 5.45.x 10-6 uCi/cc. This.value is approximately ten' times higher.than the current noise levels and is 10 percent 'of the calculated maximum setpoint value.
This request modifies the subject change by adding additional conservatism.
to the originally proposed CROAI radiation high alarm / trip'setpoint.
Therefore, this request has no impact on the determination of.no significant hazards provided with the initial proposal.
Should you have any questions or-comments concerning this' request, please contact Paul Caropino at (504) 739-6692.
Very truly yours, R.F. Burski Director Nuclear Safety RFB/PLC/ssf cc:
L.J. Callan, NRC Region IV C.P. Patel, NRC-NRR R.B. McGehee N.S. Reynolds NRC Resident Inspectors Office Administrator Radiation Protection Division (State of Louisiana)
American Nuclear Insurers