ML20206G611

From kanterella
Jump to navigation Jump to search
SER Supporting Employee Concern Element Rept OP 31105, Alara
ML20206G611
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 11/04/1988
From:
NRC OFFICE OF SPECIAL PROJECTS
To:
Shared Package
ML20206G037 List: ... further results
References
NUDOCS 8811220325
Download: ML20206G611 (2)
v • d • e


Text

n_ . ., , -

o o - ,

I

[p nc9]c, UNITED STATES NUCLEAR REGULATORY COMMISSION

! ' M__ / i?

wa sHING TO N. D. C. 20$$$

Nv/ ,y

%, u SAFETY EVAltfAT109 REPO?T BY THE OrriCE OF SPECIAL PROJEC'S EVPlovEE COW.ECN ELEMENT RETORT OP 31105, "ALARA" TENNESSEE VAll.EY AllTHORITY SEOUOYA4 NUCLEAC DOWER PLANT UNITS 1 & 2 DOCKET t.CS. 50-3?7 AND 50-328

!. Sub4et Category: Operations (30000)

Subcategory: Health Physics (31100)

Element: ALARA (31105)

I Tne basis for Element Report OP 31105, dated December 31, 1986, are the following empicyee concerns:

XX-85-052-C01: Manway Ocor at the bottom of steam generator takes a: prod stely 20 minutes to open and 3-4 hours to cicse

' due to c0mplicated process necessitated by poor design.

If a cc-e-along slips, it is most likely that personnel acul: ce cinred bet.een the soi g-arm and hanc rail.

There are 5 rems /nour escaping ' Mie t'1is door is open. A ,

way to cpen/cicse this door mus. ce found that would take on'ly 20 minutes total. Units 1 a.3 2.

J IN-35-365 001: Duplicate of n-85 052-001 writter for Watts Bar. .

s '

  • IN-56-0Aa 001; Drocess nenitoring instrumentation (0-PI-77-197, d

C PI 77-176, 0-PI-77-3A) is located in a high radiation  !

area. Because these instruments nave required excessive j

amounts of ti e to re; air and 'e:alibrate, the ALARA

! concept .ould ce better served y moving the panel (0 L-14) to a lower raciation area.

'a 5 N: 0065:

Tne ti e recuired to calibrate or recair 1-ti-77 125, 126, l 4

41), 411, .nien are located in t e race ay on Unit 11s a  :

cotential ALARA concern. l I

  • !. _3u- ary Of I55ee f A. C:r ear a'-Ci2-001 Ei:ess.e ti e and en tsure is re:uire: 10  ;

Ne'e is al iO 3' '

i re :se a ee 1:e i*.ta Ci*e#ater *a'a! i

~

A str' a' l afe t,.
:* c e "  !

l 8911220325 881104 I PDR ADOCK 05000327 i i P PDC l

E - -

B. Concern IN-55-869-001. Duolicate of XX-85-052-001 written for Watts Ear.

C. Concern IN 56-044-001. Process monitoring instruments are in a hign radiation area and should ce movea to a 'cwer radiation area to reduce exposures during calibration and repair.

D. Concern WBN-0065. The location of certain level transmitters presents an ALARA concern for calibration and repair.

III. Evaluation A. XX-052-001 and IN-85-859-001. TVA reviewed actions taken on the findincs and recommendation in a previous NSRS evaluation of this area (fiSRS Report I-55S-SQN). It was determined that the licensee nac taken action to reduce exposures during steam generator work and that additional actions were being evaluated for implementation.

ine licensee had started using nydraulic torque wrenches to reduce the time recuired to close the manways and a new stud and nut cc5 figuration that would also save time was being readied for implementation. Use of electric hoists to replace chainf alls and co?e-alongs was also being evaluated. During the recent steam generator eddy current testing on Unit 2, a new manway shield was used which reduced overall general area radiation levels by 80-94 percent.

S. IN-56-004-001. TVA inspected the control panel location and reviewed radiation work permit (RWP) time sheets from the area for the period January 1,1984 - August 4,1986. It was determined that tre control panel is not located in a high radiation area. General area d0se rates are a maximum of 7 millirems per hour. There were 164 RWP entries during the review period for all types of wor <,

including maintenance and calibration, and a total of 152 millirem

.as received. Only 20 millirem was expe- ed for calibration of instrumentation.

C. WEN-0065. IVA determined that the level transmitters are located at t e 679 elevation of the Unit 1 containmen and are calibrated on an 12 montn frequency or at each refueling. Review of RWP time sheets revealed tnat the total exposure received during the period July 7, 1954 - Octccer 7,1955, f or calioration, 'nspection, and repair of the level transmitters was 321 millirem.

IV. Conclusion Ine NR" staff believes that TVA investigation of tne concerns s adecuate, and their resolution of concerns as described in Element Recort OP 31105 is acceptable.

_

Retrieved from "https://kanterella.com/w/index.php?title=ML20206G611&oldid=3058634"