ML17325B238
| ML17325B238 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 06/16/1989 |
| From: | Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| AEP:NRC:0980T, AEP:NRC:980T, NUDOCS 8906200323 | |
| Download: ML17325B238 (12) | |
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ACCESSION NBR:8906200323 DOC.DATE: 89/06/16 NOTARIZED: NO DOCKET FACIL:50-316 Donald C.
Cook Nuclear Power Plant, Unit 2, Indiana 6
05000316 AUTH.NAME AUTHOR AFFILIATION
'ALEXICH,M.P.
(formerly Indiana
& Michigan Ele RECIP.NAME RECIPIENT AFFXLXATION MURLEY,T.E.
Document Control Branch (Document Control Desk)
SUBJECT:
Forwards "Steam Generator Repair Proj Radiation Protection Activities Interim Rept 4 for 881121-890131."
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Indiana Michigan Power Company P.O. Box 16631 Columbus, OH 43216 AEP:NRC:0980T Donald C.
Cook Nuclear Plant Unit 2 Docket No. 50-316 License No.
DPR-74 STEAM GENERATOR REPAIR PROJECT RADIATION PROTECTION INTERIM REPORT NO.
4 U.S.'Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 ATTN:
T.
E. Murley June 16, 1989
Dear Dr. Murley:
As required by section 7.3 of the Safety Evaluation by the Office of Nuclear Reactor Regulation related to Amendment No.
100 to Facility License No. DPR-74, enclosed is one copy of the Steam Generator Repair Project (SGRP) Radiation Protection Interim Report No. 4.
This final report summarizes the activities of the Project Radiation Protection/ALARA Group (PRPAG) for the period November 21, 1988, to January 31, 1989.
Attachment 1 to this letter provides details of activities for each group:
Radiation Protection Operations, Training, Radwaste, Support Services and Dosimetry.
The Project ALARA group tracked exposure on a per shift basis and reported the weekly totals in the Project ALARA Committee and the Project Management weekly meetings.
Attachment 2 to this letter provides a comparison, on a weekly basis, of the actual man-rem expended versus the revised estimated man-rem expenditure during the final phases of the Project.
The reported weekly estimate is derived by calculating the job percent complete based on actual RWP man-hours compared to 323,928 revised total Project RWP man-hours.
The estimated man-rem expenditure through January 31,
- 1989, was 1032 man-rem.
Actual man-rem expenditure was 832 man-rem measured by SRD.
Official dose as measured by TLD was 561.
(
3906200323 S5'0616 PDR ADaCK OS000aiw PDC
Dr. T. E. Murley AEP:NRC'0980T This will be the final Radiation Protection Interim Report submitted since the Project's work scope of activities was brought to a conclusion on January 31, 1989.
Unit 2 was returned to service on March 17, 1989.
This document has been prepared following Corporate procedures that incorporate a reasonable set of controls to ensure its accuracy and completeness prior to signature by the undersigned.
Sincerely, M. P. Alexich Vice President edg Attachments cc:
D.
H. Williams, Jr.
W.
G. Smith, Jr.
- Bridgman R.
CD Callen G.
W. Bruchmann G. Charnoff NRC Resident Inspector
- Bridgman A. B. Davis, NRC Region III
ATTACHMENT 1 TO AEP:NRC:0980T STEAM GENERATOR REPAIR PROJECT RADIATION PROTECTION ACTIVITIES NOVEMBER 21, 1988 TO JANUARY 31, 1989
t COOK NUCLEAR PIANT, UNIT 2 STEAM GENERATOR REPAIR PROJECT (SGRP)
RADIATION PROTECTION INTERIM REPORT NO. 4 (FINAL REPORT) 1.0 Introduction Indiana Michigan Power Company repaired the four steam generators at the Cook Nuclear Plant Unit 2 which suffered secondary side tube degradation due to intergranular attack/stress corrosion cracking at the tube support plate and tube sheet regions.
Since this type of large-scale maintenance had the potential for individual and collective radiation exposures beyond that of routine maintenance, as part of the Amendment 100 request, we provided the NRC a description of the project's planned radiation protection program.
The radiation protection program was described in the Steam Generator Repair Report submitted November 7, 1986.
The status of the Radiation Protection Program from November 21, 1988 to January 31, 1989 is provided below.
2.0 Hi hli hts for the Period Project work for November 21 - November 30 included magnetic particle testing of girth welds, secondary side hydrostatic testing for steam generators (S/G) ¹2 and ¹3, removal of temporary shielding, installation of insulation, primary side hydrostatic testing and cool down, and turnover of upper containment to the Plant on November 30, 1988.
Project work restoration, free release
- trailer, and for the month of December included containment tool and equipment decontamination, survey for of material, removal of the respirator cleaning turnover of lower containment to the Plant.
Project work for the month of January included refueling, insulation final adjustment and modifications, anchor bolt installation in -the liner plate, painting of the S/G doghouses and final paperwork closeout.
3.0
~Dosimetr The PRPAG dosimetry staff completed its support of the project and officially turned over all radiation exposure history files to the Plant Radiation Protection Manager.
The SGRP Dosimetry Records section was officially implemented on April 1,
- 1988, and terminated on January 31, 1989.
A total of 1,277 unique individuals were badged on the SGRP.
A total of 561 man-rem as measured by TLD was expended for the SGRP.
A total of 370 administrative 'dose limit extensions were processed.
A total of 236 Radiation Exposure Investigations were conducted, to assign worker dose when a discrepancy existed between SRD and TLD dose.
Page 2
Approximately 6,500 whole body TLDs, 500 multiple TLDs, and 500 extremity TLDs were issued to personnel during all phases of the SGRP.
Dosimetry performed 3,047 whole body counts, 925 respiratory fit tests, and issued 1,366 termination letters.
These numbers reflect the fact that workers left and later returned to the SGRP.
During the SGRP there were no positive whole body counts
(> 1% of maximum permissible body burden).
4.0 Training The PRPAG Training Staff began to ramp down activities as the Project began to de-staff.
During November only continuing and requalification training classes were given.
On December 14, 1988, Project Training taught their last class.
Final total workers trained were:
- Respiratory Protection
- Nuclear General Employee Training Project Specific Training
- Supervisor ALARA
- Radiation Protection Technician 1009 1256 442 22 159 A total of 424 classes were conducted throughout the Project, all taught by two full time instructors and one back up instructor.
5.0 The SGRP computerized dose tracking system, PRISM, remained operational through the period. It was removed from service on January 31, 1989.
While active, the PRISM system had maintained information on 1277 project workers including demographics, dose history, training, qualifications and access information.
In addition, PRISM maintained the 263 RWPs written to support. the SGRP.
6.0 Radiation Protection 0 erations During the period, the RP operations group allowed technician attrition to reduce ranks as work areas decreased.
The major activity this period involved radiation surveying, segregating, and free releasing or dispositioning material, tools and equipment used during the SGRP.
There were 14 Personnel Contaminations which involved contamination of worker's skin and/or clothing (Project total - 130) and four Radiological Occurrence Reports
Page 3
involving deviations of radiation protection procedures (Project total - 57) during 43,212 RWP hours of work (Project total - 378,988).
7.0 Su ort Services Support Services personnel assisted the repair contractor in the expeditious removal of tools and equipment from the work area to the decontamination area and then to the free release survey area.
The respirator cleaning trailer was. disconnected and shipped back to the vendor in December.
The tool and equipment decon trailer was shipped back to the vendor in February.
8.0 Radwaste Radwaste group personnel made six shipments in this period through January 31, 1989.
Two more shipments containing Project Waste were made in the following weeks.
The Radwaste shipment totals accumulated over the course of the Project are as follows:
Total Number of Shipments:
Total Volume Shipped:
SGRP'alance of Plant:
26 39,602.5 Net Cubic Feet 32,498.3 Net Cubic Feet
.7,104.2 Net Cubic Feet Total Weight Shipped:
SGRP:
Balance of Plant:
727,870 Net Pounds 629,860 Net Pounds 98,010 Net Pounds Volume Buried (as of 3-31-89):
10,074 Cubic Feet SGRP:
10,003.3 Cubic Feet Balance of Plant:
70.7 Cubic Feet 9.0 ALARA The PRPAG ALARA group completed post job reviews and work package closeouts for all 128 work packages.
In addition, all ALARA files were reviewed and closed, including:
42 shielding
- packages, and 13 contamination containment packages.
The ALARA committee held 2 meetings during the period and was then disbanded at the end of the Project.
In the final stages of paperwork closeout, ALARA took the lead in getting PRPAG records transferred to the Plant vault.
10.0 Dis osal of S
G Do house Wall Concrete On February 29,
- 1988, an application was submitted to the NRC for onsite disposal of contaminated S/G doghouse wall concrete in accordance with 10 CFR 20.302(a).
This application contained a detailed description of the material, analysis of the effect on the environment from the disposal of the
Page. 4 material and of commitments to be followed to minimize the risks of radiation exposure.
On August 30, 1988 approval was received from the Commission for onsite disposal of the S/G doghouse wall concrete.
All S/G concrete wall concrete was disposed of in accordance with the approved application.
ATTACHMENT 2 TO AEP NRC:0980T COMPARISON OF ACTUAL MAN-REM EXPENDED VERSUS REVISED ESTIMATED MAN-REM EXPENDITURE
i4
1200 aUBl CLOSE OUT PHASE
- PERSONNEL EXPOSURES (SRD}
ESTIMATE VS.
ACTUAL
% ACTUAL IZ2 ESTIMATE 1000 800 600 400 200 10/10 10/17 10/24 10/31 11/7 11/1 4 11/21 11/28 WEEK Estimate derived from 1032 total man-rem and hours complete
- Dose for this phase includes integrated dose from previous phases
1200 SGHP CLOSE OUT PHASE
- PERSONNEL EXPOSURES (SRD)
ESTIMATE VS.
ACTUAL
% ACTUAL IZ2 ESTIMATE 1000 800 LA O
600 400 200 12/5 12/1 2 12/1 9 12/26 1/2 1/9 1/1 6 1/23 1/31 KEEK Estimate derived from 1032 total man-rem and hours complete
- Dose for this phase includes integrated dose from previous phases