ML20246L109
| ML20246L109 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 08/25/1989 |
| From: | Hunsader S COMMONWEALTH EDISON CO. |
| To: | Murley T Office of Nuclear Reactor Regulation |
| References | |
| 0028T, 28T, NUDOCS 8909060226 | |
| Download: ML20246L109 (3) | |
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August 25, 1989 x
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.DrW Thomas E. Murley,. Director:
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LU.S. Nuclear Regulatory Commission Washington, DC 20555' z
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iAttn:. Document Control: Desk-
Subject:
Byron Station Units 1 and 2 Braidwood~ Station Units 1 and 2 Application for: Amendment to
. Facility Operating Licenses NPF-37,--NPF-66
'NPF-72 and:NPF-77 AppendixtA, Technical Specifications NRC Docket.Nos. 50-454, 50-455, 50-456 and'50-457-
Reference:
-(a) March 17, 1989 S.C. Hunsader letter to'T.E. Murley
Dear.Dr. Murley:
. In reference (a) pursuant-to 10 CFR 50,'90,; Commonwealth Edison
'(Edison) proposed to amend Appendix A.. Technical Specifications, of' Facility x
Operating Licenses-NPF-37, NPF-66,-NPF-72'and NPF-77. The proposed amendment requested a change to Technical Specification 4.5.2 to modify the existing surveillance requirements for. venting of ECCS discharge piping.
This change
.is expected to reduce exposure to radiation in accordance with ALARA guidelines without reducing ~the safe operation'of the ECCS equipment.
The purpose of this letter is to supplement reference (a) with additiona1'information that presents the amount of radiation exposure expected to be saved. Attachment A provides a representative example for Byron Unit 1
.and Braidwood Unit'1,'with respect to radiation exposure This review was performed for Unit I at~each station because seven (7) hi3h point vent valves are installed inside containment in Unit-1, in the Safety Injection (SI) lines.-that are'not installed-inside Unit'2.
During the upcoming scheduled meeting at firaidwood Station on September 25 and 26, 1989. Edison will discuss theidetails'of.our-review in this area that demonstrates the acceptability of this~ difference in support of the Technical Specification Amendment requestA*I I
8909060226 890825
-PDR-ADOCK-05000454
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Dr. T.E. Hurley August 25, 1989 Please direct any questions you may have concerning this submittal to this office.
Very truly yours, A c. 7 M S.C. Hunsader Nuclear Licensing Administrator
/sc1:0028T:20-21 Att.'s (A):
ECCS Piping Vent Valve Radiation Exposure Savings cc:
Resident Inspector-Braidwood Resident Inspector-Byron L.N. 01shan-NRR S.P. Sands-NRR Regional Office III M.C. Parker-State of Ill.
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ATTACHMENT A BYRON /BJMIDHQQQ ECCS PIPING VENT VALVES UNIT 1 RADIATION EXPOSURE SAVINGS ASSUMPTIONS:
UNIT AT FULL POWER GENERAL AREA DOSE RATES (utilizing low dose hold areas)-
0.25 HOUR STAY TIME PER LOCATION-3 PERSONNEL PER LOCATION PERFORMED MONTHLY (le 12 INSPECTIONS PER YEAR) 4 LOCATIONS AT 377R06, R07 7 TO 10 MR/HR X 4 LOCATIONS X 3 PERSONS X 0.25 HOUR 30 MR/ PERFORMANCE 30 MR/ PERFORMANCE X 12 PERFORMANCE
-0.25-0.36 MAN-REM / YEAR
-0.32 AVERAGE MAN-REM / YEAR 2 LOCATIONS AT 412' R06 10 TO 20 MR/HR X 2 LOCATIONS X 3 PERSONS X 0.25 HOUR 30 MR/ PERFORMANCE 30 MR/ PERFORMANCE X 12 PERFORMANCE
=0.18-0.36 MAN-REM / YEAR
-0.27 AVERAGE MAN-REM / YEAR 2 LOCATIONS AT 412' R02 50 TO 150 MR/HR X 2 LOCATIONS X 3 PERSONS X 0.25 HOUR 225 MR/ PERFORMANCE' 225 MR/ PERFORMANCE X 12 PERFORMANCE
=0.9-2.7 MAN-REM / YEAR
-1.8 AVERAGE MAN-REM / YEAR TOTAL AVERAGE YEARLY MAN-REM SAVINGS:
0.32 + 0.27 + 1.8 - 2.39 MAN-REM
/sc1:0028T:22