ML20211Q926

Confirms Commitments Made in 870211 Meeting W/Region V to Discuss Meteorological Sys & Emergency Dose Assessment Methodology Improvements.Detailed Commitments Re Sys Hardware Changes & Administrative Procedure Changes Encl

ML20211Q926
Person / Time
Site:	Rancho Seco
Issue date:	02/26/1987
From:	Julie Ward SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Miraglia F Office of Nuclear Reactor Regulation
References
JEW-87-228, NUDOCS 8703030220
Download: ML20211Q926 (4)

Text

'

esuu.

SACRAMENTO MUNICIPAL UTluTY DISTRICT G P. O. Box 15830, Sacramento CA 95852-1830.(916) 452-3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA JEW 87-228 February 26, 1987 Director of Nuclear Reactor Regulation Attention: Frank J. Miraglia, Jr.

Director PWR-B Division US Nuclear Regulatory rw einnion Washington DC 20555 Docket 50-312 Rancho Seco Nuclear Generating Station Unit #1 License No.DPR-54 METEORDIOGICAL SYSTD4 AND PROGRAM IMPROVDOTIS

Dear Mr. Miraglia:

Messrs. Miner and Spickler of ONRR and Messrs. Wenslaski, Fish, et al., of Region V, met with District staff on February 11, 1987, to discuss Meteorological System and Emergency Dose Assessment Methodology improvements.

'Ihis letter is sulxnitted to affirm cmmitments made by the District which will be cmpleted prior to restart.

Attachment A provides detailed cmmitments regarding system hardware changes, administrative procedure changes, and training program changes. As discussed with Mr. Spickler, the District requests return confirmation of approval to remove dew point sensors from operation. Dew point information is not needed for required annual or semiannual reports or dose calculational input. 'Ihe District, therefore, interris to remove these sensors fran operation upon receipt of written approval.

Attachment B provides detailed ccanitments, to be cmpleted prior to restart, regardirxJ Emergency Dose Awsent Methodology.

An additional submittal regarding long term program improvements and a schedule for implementation will be provided by April 1, 1987. 'Ihis submittal will address the proposed resolution of concerns regarding delta T divergence relative to tower location and configuration, as well as wind speed and direction concerns relative to tower interference.

i KO hhhp i

PDR l

DISTRICT HEADQUARTERS O 6201 S Street, Sacramento CA 95817-1899

The District also cxmnitted to submit a proposed amendment to Technical Specifications, to include the meteorological monitoring system, prior to l restart.

If you have any questions cancerning this subnittal, please contact Mr. Robert Myers of my staff at (916) 732-6025.

I Sincere y,

(

E. Ward Deputy General Manager, Nuclear i

Attachments (2) cc: Region V (2)

Tony D'Angelo i Sydney Minor i

I i

1 l

l l

ATIAOMENT A SCOPE:

By restart: Efforts to further reduce delta T divergence will be inplemented; Formalize h = ntation and interdepih.i.amuival coordination; Inprove surveillance procedures and calibration methods; Inprove training.

DETTAIIS:

1. Hardware

a. Place 10 meter temperature sensors in same motor aspirated shield (current primary channel)

b. Provide motor aspirator failure indication (10 meter) in Control Room

c. Dew point sensors relocated in aspirator shield (current backup channel)

d. Remove dew point sensors upon receipt of NRC approval

2. Procedures

a. Revise AP.66 and AP.67.

1) Define data archival process

2) Formalize organization and interdepartment coordination

b. Revise SP.200.17 and I.016

1) Stand alone surveillance procedures

2) Incorporate MIDAS and NOVA QC checks

3) Calibration of NS/WD sensors in wind tunnel on rotating

. basis

3. Training

a. Update on system changes and procedure changes

b. Basic meteorology theory i

i l

l l

l l

ATDGMENT B i

RESTART COMIIMENIS TO THE NRC EUR DOSE ASSESSMENT SCOPE:

By restart: All of the sir.rwcy preparedness dose calculation procedures will be re-written and revised; The mimcwWter backup for dose assessment system (Apple) will be replaced by a hn=nted IIM-PC/AT system; The IDAM, which is the primary dose acaanament system for tle Control Room, will be upgradad to include dose projections for 2, 5, and 10 mile areas and all relaaaa points; A purchase order for an upgrade or replacement for the MIDAS dose projection system will be iamwi by restart.

DETTAIIS:

1. The iodine fraction removed by the plant vent charcoal filters will be established for the reactor building stack and auxiliary building stack.

2. A methodology for performing +v:a calculations for releases through the secondary side will be developed.

3. Instructior's for the use of the backup dose assessment ocmputer system will be included in the emergency dose an===nt procedures.

4. The NOVA cartputer will be included in all dose ancaam=nt procedures as a backup source for meteorology.

5. A purchase order for class "B" meteorology model will be issued by restart.

6. The iodine fractions for various accident scenarios will be reviewed and revised as rwwiad.

7. The revised &vm amman==nt procedures will incorporate methodology to convert containment high range monitor readings to source terms.

(

8. Fifteen minute average meteorology will be provided to the IIRDS dose projection system.

9. AP.512 to be revised to include methods for evaluating hypothetical accident conditions.

10. Dose assessment procedures will be modified to address changes to dose assessment software.

11. Backup dose assessment program will be approved under AP.52

12. A presentation to NRC on changes to dose assessment programs and procedures will be conducted before restart.

l t

r

. - . . m--._m-. __ - ,_ ----,,-y__- , , , - - - , -. _.-- - - __ y- -