ML20127C744

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Partially Deleted Incident Rept 1-89-97 Dose Assessments & Associated Hpes Involvong Rj Brooks & Assoc Steam Generator Fosar Activities at Facility
ML20127C744
Person / Time
Site: Beaver Valley
Issue date: 11/08/1989
From: Blair D
DUQUESNE LIGHT CO.
To:
Shared Package
ML20127C734 List:
References
FOIA-92-245 NUDOCS 9301140322
Download: ML20127C744 (15)
v • d • e


Text

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DUQUESf1E I.!Gili COMPAt1Y .

iluclear Group iluc le a r Ope r at ions Se rvice s Unit Radiological Cont rol D(pa rtment tiovember 8, 1989 flG3RSD 156 Incident Report 1-89-97 Dose Assessments Mr. J.A. Kosmals

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The referenced incident report and associated itPES involving the R.J. Brooks

& Associates steam generator (S/G) FOSAR activities at Unit I serve as the basis for the evaluation and assessment of the occupational radiation exposure to nessrs. K lG 3 Z [$$1 M for the date of incident, September 28, 1989 and the trenitorthfFEFTbd.

STATE!!EtiT OF SITUAT10!1 The relocated whole body TLD, which was worn on the right arm just above the elbow during the S/G secondary-side handhole work on September 28, 1989, did not remain at the initially attached location for two of the workers. This created a situation in which the TLD processing result would not represent the total whole body dose for the affected workers.

DATA RESOURCES FOR DOSE ASSESSt!EllT Radiation exposure for the whole body was assessed using a combination of information gathered for the incident report such as worker extremity and whole body TLD processing results log book entries for FOSAR work: Radiation Technician and FOSAR work crew statements; measurements and arm position testing using the full scale mockup of the tube sheet area, handhole and steam generator shell: special irradiation tests of TLD material on a mannequin arm as i n s e.r t e d in the 'B' steam generator hand hole number 21 and written records of incremental changes in the pocket dosimeter readings for dose tracking.

DECIS10t4 LOGIC The following logic was used to substantiate our case for the dose results which are listed in FillAL D0SE RESULTS section:

1. Extremity TLD processing data is considered valid for all FOSAR workers.

Basis

a. All extremity TLDs were worn as prescribed at the area on the back of the hand.

Inforrn3 tion in this record was deleted in accordance with thj Freedxn elInformation A 1 Act, exemptions o _.

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b. The T1.0 versus right hand /left hand pocket dosimeter readings for agieed with the Me s s r s %'][ME35[.IlstinEd!g&M'/.

corresoMingILDelement 3 r e sul t s wTEhin tT2o + 117 . e x c l u d i n g T]f7 ? right hand offscale DRD result.

c. An inspection of the TLD dose generation report and each TLD element result indicates the information does not contain unusual data nor do element-to-elemant variations and ratios appear unexpected for this type of work.
2. Using the revised e n t irna t e s of hand-hole entry times (see IR 1-89-97 HPES). the estimated ex rates derived are in reasonably good a g r e e rr e n t for[] ] { { posure] pand the September 13 survey data .

of 10R/hr.

Basts:

a. The average of TLD element 3-to-DRD ratio was 0.94 for both whole-body and extremity. '
b. Usine in ormation in (a) and the 11.D e l e me n t 3 (E3) result from

%d[ TLD $ EdP approximately ( 7856.44f/ 0.v4) = 8400 mR.

right-hand DRD would have read l c. The list below establishes the credibility of the initial survey data for the job:

Time DRD Exposure Rate Name (min) (mR) (mR/ min) (R/hr)

, 46 8400 183 11.0 lt;Qtes 23 3100 135 8.1 M' 6 950 158 9.5

3. The dose rate at the location just above the elbow (upper arm) for a full arm insertion was determined using an irradiation test with Panasonic UD812AS2 TLDs (refer to Figure 1). The dose rate at the location just above the elbow was:

Shallow = 108 mrem / minute Equivalent to 6.48 rem /hr Eye = 108 mrem / minute Deep = 107 mrem / minute Basist

a. TLD dose Eeneration report dated 10/06/89 11:15 hours.

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4 J.A. Mosnal NC3RSD:156 -

~ ~ ' ' M e M ".'. l M Novettbe r 8. 1989 C f 3 .. r l'ag,e 3 The whole body assesstrent for 4

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and is the sum of the calculated upper arm dose during the displacement periods and the TLD processing record results as follows:

]k estimated traximum whole-body dose for the monitoring period in question is assessed as Hs = (13 min x 108 mrem / min) + 552 mrem = 1,956 mrem He = (13 min x 108' mrem / min) + $52 mrem = 1.956 mrem Hd = (13 min x 107 mrem / min) + 471 mrem = 1. 86 2 .n am j' estimated maximum whole-body dose for the monitoring period in quesflon is assessed as:

Hs = (6.98 min x 108 mrem / min) + 203 mrem = 957 mrem He = (6.98 min x 108 mrem / min) . 202 mrem = 956 mrem Hd = (6.98 min x 107 mrem / min) + 202 mrem = 949 mrem Basist

a. TLD processing records F89-204 and F89-205 dtd. 9/29/89 0207 hrs,
b. Interview with contractor Radiation Technician D. Kennedy and a review of S M iog book for the number of uppet* arm ansertions, typical stay times of 2-3 minutes er insertion and a final 7 minutesupperarminsertionby]Q-c M ( @ right hand extremity TLD ratio of (5.640/10,500) 0.54 used to serve as the basts o f f.fg M 'rtaximum upper arm-insertion time relative t o"G7 i3
  • minutes i.e. 0.54 x 13 min. = 6.98 minutes. -

FINAL DOSE RESULTS The current external radiation exposure data extracted from the workers' NRC o Form 5 equivalent is presented below:

QUARTER DOSE YEAR-TO-DATE DOSE (rem) (rem)

NAME Shallow Eye Deep Shallow Eye Deep

=

whol'e W By -- 2.076 2.076 1.982 2.518 2.518 2.424 extremity RH 11.172 --- ---

11.859 --- ---

LH 1.501 --- ---

1.943 --- ---

' -- whole body -- 1.659 1.637 1.588 1.942 1.890 1.822 ext remity RH 6.342 --- ---

6.771 --- ---

Lil 3.272 --- ---

3.686 --- ---

J.A. Kosrtal flG 3 R S D i l 56 ..

-';'**7"ON flovember 8, 1989 page 4 ' ' *f*.)I . .

A review was conducted of each worker's f1RC form 4 equivalent for the applicable expos"re monit oring period. Each flRC Form 4 equivalent was a complete radiation exposure history with record dose entries. This permits the quarterly whole body dose of 3 rems to be the applicable dose limit providing the available 5(ll-18 ) dose bank _ does not cap the permissible quarterly limit of 3 rems. Each worker had well over .1 rems in the remaining 5(n-18) dose bank. Based on __ t his_ review and the above assessments. no regulatory dose limits were exceeded.

The current state of the termination occupational radiation exposure reports (fiRC form 439) are presented as Attachments 1 and 2.

This letter will be attached to an RCH form 4.4 Section 2- "Do s irne t ty Inconsistency / Dose Assessment Report" for Hessrs.y [ y nd filed with each worker's occupational radiation exposure history itle in the ERC.-

i D. G. Blair DGB/mam Attachments cc E.D. Grada -

D.O. Cirdwood R.M. Vento Central File (2) t

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. . OCCUPATIOflAL RADIATIOil EXPOSURE REPORT November 14 198'O t ~ac.cr~u avuussi I

DPR-66, NPF-73 soau en e.aa o mi work anignment or employment with Duquesne L .

1 Naut ano apoat Ss or asacarua tr.4Nss: P ART f.- UCENSEE AND INDMDUAL IDENT1FIC ATIONe DATA >> -

s ' e#f'" At J n DuTJe ane 1,1ght Cornpany

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Beaver Valley Power Station P.O. Box 4 Shippingport, FA 15077 t haut awo aoongsa os Iwato,in y osH At41 snow 4eovt openas:

R. Brooks Associates, Inc.

P.O. Box $88/7211 Furnace Road On t a rio, ifY 14519 t scca sacuaireuvusta: 7. cart iwwi w ium L_ Enm PA RT il. EX1ERN AL DO9 E DATA -' e' j e nasov,st womicaus son sitansat sacsuas ro naoarow wai wor enovoso - + , -

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J Accredited Dosimetry Processing Laboratory

. r a DIAECTOR. MDIOLOGICAL HEALTH SERVICES- ' .

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This is a report of the exposure to ionizing radiation received by the individual be work assignment or ernployment with Duquesne Lighr Company at the Beaver Valle t saus a+c matas cv at.*ominaictwse: _ PA RT f. UCENSEE A ND INDjV!DUA L IDENTIFK'A TION3DA TA' ' ++"+ "J'FWi %

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shippingport, FA 15077 ,,7 i haw g

R.areBrooks Accat ts ca suetcwsa a oss(st8r Associates, Inc. Fmw asovt tecer4:

P.O. Box 588 Ontario, NY 14519 a sccA secua.rmvwesn . v. cats iei w i w y

PARTit. $iTERNAL DOsN DATA # X" h 'e. - 4 J ~ i:4? F:M l s. Prescwi novicp44 Fon txttes tAPOSdRE IO RAbdtb3 NOf POyCED ~

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STEAM GENERATOR SECONDARY SIDE HANDHOLE (F.O.S. A.R. )

Immediate Corrective Actions

1. All steam generator handhole foreign object search and retrieval (FOSAR) work was terminated.
2. A critique was held regarding this issue. In attendance were the vendors working on the job, the vendor's management, appropriate Radiological Control personnel (including the Radiation Technician covering the job),

and the General Manager of Nuclear Operations.

3. A special meeting was held with all vendor and Level 3 and 4 DLCo nanagement personnel who had personnel reporting to them for outage support. The meeting was chaired by the General Manager of Nuclear Operations. The topic of the meeting was the significance of supporting the Radiological Control Department and specifically obeying all requests by the Radiation Technicians.
4. A survey was performed in the vicinity of the top of the tube sheet where the individual had his hand positioned.

NOTE: The steam generator secondary handhole mockup was utilized to develop additional survey techniques applicable to this situation.

5. A survey was performed in the area of concern with respect to whole body exposure (above the elbow).
6. A verification' survey was performed to ensure that no conditions had changed in the steam generator secondary haadhole. This was done to verify that the dose rates initially used by the Technician had been appropriate.
7. Radiological Control Manual. Chapter 3. Rp 8.1, was revised to incorporate -

a tracking mechanism for extremities when working in the steam generator secondary handholes.

8. A TLD tree was utilized to establish a dose gradient inside the 'B' steam

-generator handhole.

9. Modified the Radiological Work Permit to incorporate specific _ corrective actions.
10. The vendor by memo to the General Manager, Nuclear Operations, acknowledged-that they will comply with controls as discussed at the critique,
11. Director of Radiological Operations issued a letter to all _ Radiological Control foreman and outage coordinators emphasizing the Radiation Technician's stop work authority.

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.1 Reviewed by: -

Date:

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Remarks Pertinent information for job - possible radiological problems prior to and during the job.

Reviewed by: Date: f//f[fi

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