ML19352A842
| ML19352A842 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/29/1981 |
| From: | Baskin K SOUTHERN CALIFORNIA EDISON CO. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8106020206 | |
| Download: ML19352A842 (3) | |
Text
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^U; Southern California Edison Company P O. SOX 500 22 44 WALNUT GROVE AVENU E MCSEMEAC CALIFO9NI A 91770 MLE*"O*E K. P. 8 AS KIN 3{3y ]g, JggJ (2131,72-1401 Mamaata 08 NWCLEA8 ENGiNgge:NG, S A F(f W. AN D pC t N14NG Director, Office of Nuclear Reactor Regulation Attention:
D. M. Crutchfield, Chief
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Operating Reactors Branch No. 5-Division of Licensing Y
vg U.. S. Nuclear Regulatory Commission
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Gentlemen:
msllyrcer co
Subject:
Docket No. 50-206 s
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Steam Generator Repair Program San Onofre Nuclear Generating Station Unit 1 This letter confirms telephone discussions with members of your staff in April and May,1981, regarding information relating to the environmental impact of tne current steam generator sleeving program at San Onofre Unit 1.
The information is contained in the enclosure to this letter.
If you have any questions concerning the enclosure, please contact me.
M day of h e
, 1981.
Stmscribed on this Jf
/
By K. P.~Baskin Manager of Nuclear Engineering, Safety, and Licensing Subscr%ed and sworn to before me on this J r day dea
, 1981.
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Notary D1ic in and for the County of Los An eles, State of California Enclosures as stated 3 ::: r re r grg y - "
i AGNES CR ABMC cc:
R. H. Engelken, Director, ole, Region V
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L. Miller USNRC Resident Inspector I Q, T%Qg"
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=o ENCLOSURE
-INFORMATICN RELATING TO ENVIRONMENTAL IMPACT STEAM GENERATOR SLEEVI;4G REPAIRS SAN ON0FRE UNIT 1 1.
Final person-rem exposure for. sleeving repairs --
J The final occupational exposure, including uncorrected exposure determined by dosimetry incurred in May,1981 and an estimate for scheduled rework in June, 1981, incurred during the steam generator-sleeving repairs is projected to be 3496 person-rem.- This exposure has been broken down by activity as follows:
' Exposure (Person-Rem)
Activity Special Maintenance
- Decontamination 173 Tube Surface Preparation 279 Sleeving 2780 Rad Waste 36 Routine Maintenance-69 Inservice Inspection 42 Special Tests 117
- Includes 109 person-rem for Health Physics and 22 person-rem for Supervisory Review 2.
Total numoer of individuals involved in the sleeving repairs --
The total number of individuals involved in the sleeving repairs was approximately 2,400; 1500 temporary maintenance personnel and 900 project support personnel.
3.
Reduction of dose rates in hot leg channel heads --
The reduction of the dose rate in the hot leg channel heads of the steam generators was achieved using decontamination and shielding in the channel heads. The average reduction in dose rate was 3.38 with the reduction in each steam generator hot leg channel head as follows:
Steam Generator A - 3.27 Steam Generator B - 3.04 Steam Generator C - 3.82 4.
~ Airborne releases, liquid releases and solid wastes --
The airborne releases generated during the sleeving repairs was 9.97 curies Tritium ana 5.45 E(-6) curies Particulates. The liquid releases generated during the. sleeving repairs was 5.44 curies Tritium and 2.61 curies Mixed Fission and Activation Products. The solid wastes generatea j
during the' sleeving repairs was 30,334 cubic feet containing 170.8
~.
,w
.'8.
- radioactivity. This airborne and liquid releases have-been'
- curse broken 'down on a monthly basis and the solid wastes have been broken down'
~
by type as follows:
~
-Gaseous Releases Liquid Releases Month' Tritium Particulates Tritium tiixed Fission and
'(ci)
(ci)-
(ci)
Activation Products (ci)
Sept. 1980 1.23 LLD 1.03
.123 Oct. 1980 1.47 2E(-6) 188
.071-
.Nov. 1980 1.7
.541*
O
- 0 Dec. 1980-1.98 LLD 846 1.25-
'Jan.'1981 1.08 LLD-0 0
Feb. 1981-852 3.47E(-6)-
.782
.136
. March 1981 882 LLD 470
.360 April 1981-775 0
2.12
.67 Solid Wastes (through April,1981)
~
Type Amount (cabic feet)
Activity (ci)_ -
Solidification Liners ~
340 1.94 Drums **
19,612 109 Boxes **
10,170
-3.45 filters and Spent Hones 212.4 56.433-4
- Believed to be due to a contaminated flask and not an actual release.
- Include waste existing on station prior to sleeving project as well as
- that produced by rther station projects 4
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