IR 05000277/1985019
| ML20127E465 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/13/1985 |
| From: | Holsopple K, Pasciak W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML20127E463 | List: |
| References | |
| 50-277-85-19, 50-278-85-15, NUDOCS 8506240559 | |
| Download: ML20127E465 (20) | |
Text
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. U.S. NUCLEAR REGULATORY COMMISSION
REGION I
Report Nos. 50-277/85-19 50-278/85-15 Docket Nos. 50-277 50-278 License Nos. DPR-44 Priority - Category C DPR-56 Licensee: Philadelphia Electric Company 230 Market Street Philadelphia, Pennsylvania 19101 Facility Name: Peach Bottom Atomic Station, Units 2 and 3 Report Prepared by: M //&#aopp/A 6-4S-85' -' K. Holsoppis,' Radiation Specialist date Approved by: M aAE T Yld b _4 - 4 -#f W. Pastfak, Chief,'BWR A diological date Protection Section, EmVrgency Preparedness and Radiological Protection Branch Inspection Summary: . Dosimetry Performance Tests (Report Nos. 50-277/85-19 50-278/85-15) Areas Inspected: This report contains the results of the performance tests of the licensee's Harshaw and Eberline dosimeters used in their personnel dosimetry program.
Licensee dosimeters were irradiated by the Dosimetry Branch of Radiological and Environmental Sciences Laboratory (RESL) at the Idaho National Engineering Laboratory. The licensee processed these dosimeters, and provided the results to Region I for evaluation. The evaluation involved 12 inspector-hours at the Region I office by two region-based inspectors.
Results: Within the areas inspected, no items of noncompliance were observed.
8506240559 850619 $DR ADOCK 05000277 PDR , e ---:- , - -
_ - , . . DETAILS 1.
Persons Contacted Licensee Personnel D. Smith, Assistant Station Superintendent A. Hillsmeyer, Senior Health Physicist N. Gazda, Applied Health Physicist NRC Personnel T. Johr'an, Senior Resident Inspector H. Williams, Resident Inspector 2.
Performance Test As a followup to a previous inspection conducted on August 20 - 23, 1984, Combined Inspection Report Numbers 50-277/84-25 and 50-278/d4-21, one hundred of the licensee's dosimeters, fifty made by Harshaw and fifty made by Eberline, were performance tested.
The dosimeters were sent to the Dosimetry Branch of the Radiological and Environmental Scier.ces Laboratory (RESL) at the Idaho National Engineering Laboratory for irradiation and then returned to the licenste for processing. The results provided by the licensee are contained in Attachment A and B.
The dosimeters were evaluated with respect to their responses (i.e., shallow dose which was measured at a depth of 7mg/cm2 and deen dose which was measured at a depth of 1000 mg/cm2) to four types of radiation fields.
These include: (1) beta radiation; no gamma radiation (shallow dose only), (2) beta radiation and gamma radiation with the beta-to gamma radiation ratio >0.9, (3) beta radiation and gamma radiation with the beta-to gamma radiation ratio <0.9 and (4) gamma radiation; no beta radiation. All irradiations were performed with point sources with the exception of those which were performed with a uranium slab source which tested the response of che dosimeters to a non perpendicular field of beta radiation. The sources were chosen to test the dosimeters' responses to various emission spectra. The Harshaw dosimeters contain two lithium fluoride elements.
Element one is unshielded and data from this element is not normally used. Element two is shielded and is used to measure gamma doses. When the Harshaw dosimeters are processed on a daily basis, the data from the unshielded element is not routinely used to estigate beta dose. The Eberline dosimeter is also a two-element lithium fluoride dosimeter, very similar to the Harshaw dosimeter.
Eberline reports its doses in terms of " gamma dose" and " beta dose."
Attached are the results of the performance tests of the Harshaw and Eberline dosimeters used at Peach Bottom (see attachment C).
Based upon a review of the results of these tests the following observations are made:
r
' l '
1.
The most common current industry criteria for acceptance performance of personnel dosimetry systems are contained in ANSI N13.11. These criteria form the basis for the performance testing in the National Bureau of Standards National Voluntary Laboratory Accreditation Program (NVLAP). This standard requires, for doses in the protection range, that the sum of the absolute value of the average bias plus the relative standard deviation of the individual biases of the reported doses be 1 css than or equal to 0.5.
Based on this criterion, the performances of both the Eberline and Harshaw dosimetry systems were acceptable with the following exceptions: a.
Both systaus failed to meet this criterion for the T1-204 irradiations when the beta / gamma ratios exceeded 0.9 (shallow dose). These constitute situations where there is a significant beta component and probably reflect the effect of the thickness of the lithium fluoride chips.
The results indicate a severe under-response to lower energy beta radiation.
b.
The Harshaw system failed marginally to meet the criterion for the uranium slab irradiation (beta only, shallow dose). The Eberline system marginally passed the uranium slab irriadiation.
This performance could reflect both the energy dependence and directional dependence of the unshielded lithium fluoride chips.
c.
Both systems failed to meet the criterion for the combired Cs-137/Sr-90 irradiation (deep dose) when the beta / gamma ratio exceeded 0.9.
This may be due to the response of the under-shielded gamma chip to the highly penetrating Sr-90/Y-90 beta radiation, and the system was effectively recording betas as gamma radiation 2.
The response of both dosimeters to Cs-137 gamma radiation appeared to be adversely affected by the presence of Sr-90/Y-90 beta radiation but not by T1-204 beta radiation.
This was probably for the reason discussed in 1.c above.
3.
The under-response of the dosimeter to a depleted uranium slab source may be indicative of the directional dependence cf the dosimeter.
Normal incident radiation is used to calibrate the dosimetry system to determine beta dose.
Since the slab source results in radiation incident on the dosimeter over a wide range of directions, the response of the dosimeter is different than that normally expected.
Whether normal radiation incidence is representative of actual field conditions depends on the orientation of the worker relative to the beta radiation field.
4.
Both dosimetry systems appear to respond to Cs-137 gamma radiation as they respond to Co-60 gamma radiation.
These matters will be examined in a future inspection (50-277/85-19-01; 50-278/85-15-01).
- --
. - - - - . .. _ .
3.
Exit Interview Dr. M. Pasciak, Chief, BWR_ Radiological Protection Section and F.
Costello, Senior Radiation Specialist, discussed the results of this inspection in a telephone conversation on June 5, 1985, with the licensee representatives denoted in paragraph. ' l '. o' Page 1 of 2 ' Attachment A . PHILADELPHIA ELECTRIC COMPANY PEACH BOTTOM ATOMIC POWER STATION R. D.1. BOX 208 DELT A. PENNSYLV ANI A 17314 Septeraber 26, 1984 The attached list of Harshaw Badges were sent to the Department of Energy in Idaho Falls as instructed by the Nuclear Regulatory Commission.
Included are the badge numbers and the corrected exposure to each chip. All readings are in mr . O e
b
v -- . ., - Paga 2 of 2 , ,,, ' Attachment A Badge Number TLD 1 TLD 2 . 717064 5.9 6.5 717046 5.4 4.8 716421 5.0 5.2 718032 114.9 43.0 717000---- -20.8-5.8-717349 633.7 450.6 718179 348.4 351.3 717204 153.5 51.9 717769 514.7 398.6 714677 65.6 6.1 714483 318.6 306.1 715165 651.7 277.5 717203 425.1 346.1 717796 476.8 342.6 719274 1759.0 1704.2 715764 310.7 131.8 717015 6.3 6.4 715732 1885.0 1666.0 717634 1062.8 612.5 715141 229.6 254.8 714983 280.0 294.6 714485 721.8 464.2 714471 145.1 55.5 715125 450.4 385.6 717600 696.6 264.3 717975 2480.6 1978.7 . 717220 1767.2 1667.3 714929 1979.9 1787.0 717044 468.1 340.5 715040 1024.9 667.3 716952 106.7 44.8 714341 45.7 7.1 718095 24.5 6.5 714752-1896.3 1853.2 718738-531.3 381.4 715202 5.4 5.6 - 714982 1796.0 1642.9 719292 311.9 113.2 716474 361.0 344.1 718824 2546.8 1992.5 717132 1758.5 1698.6 714220 108.7 6.5 718121 293.8 290.6 713879 417.9 385.4 714369 5.0 6.2 714496 1853.0 1752.8 714368 2.8 6.2-718245 276.4 263.1 716611 7.6 8.0 718739 1743.4 1709.0 717368 105.8 6.1 713400 1402.7 1856.7 ' L .
- '
). Page 1 of 2
Attachment B PHILADELPHIA ELECTRIC, COMPANY PEACH BOTTOM ATOMIC POWER STATION R. D.1, BOX 208 D ELTA, PENNSYLV ANI A 17314 October 30, 1984 The attached lis.t of Ebertine Badges were sent to the Department af Energy in Idaho falls as ins tructed by the Nuclear Reguta. tory Commission.
Included are the badge numbers and the corrected exposure to each chip as repor.ted by Eberiine Instrument Corporation, Santa Fe, NM.
Att readings are in mrem.
' -(* e e e O
p: WJgT'W o f 2- Attachment B ,. . . Badge Number Gamma Beta 4794~ 1640 230 4746
0 4724 0
4665 1496 268 4651
131 4581 1618
4558 246
4517
0 4465 525 517 9049 1625
9025
70 9002 1472
4986 1607
4925 301
4899 335
4887 '329 151 3181 1804 527 3170
0 3165
152 3106
.61 2981 303
2973 1400 190 2966
218 2958
80 2938
26 2911 437 250 2863 267
2817 1581
2778 324 169 2702 1494
- 2685 322 129 2537
65 2321 257
4402 453 479 %'4364
0 4308
0
4302 357 450 4295
15 4258 322
4192
156 . 4191 1699 . 635 4153
25 4152 213 465 4008
222 3548 356 270 " 3546 199 156 3402 340 125 3371 306
3208
0 3204 242 0' . m,.
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T I -? Oft Beta Point Soto rce
11ESL Delivered Dose Ebert ino Dose lia r ste..w Dose Shallow Qeep Dosimeter Shallow Deep Dosimeter Shallow peej 100
4153
0 717000
6 100
4295
0 718095
7 300
2537
0 714341 is6
300
2958
0 714677
6 ' 700
2938 109
71:4220 109
700
3163 152
717368 106
s.
Bias = -0.791 B ia s = -0. 812 Standa rd Deviation = 0.Ol 8 Standa rd Devia tion = 0.041
/Blas/+Standa rd Devia tion = 0.838* /Blas/+Standa rd Deviation = 0.852' y c+ c+ os Notes: 1.
Ebert Ine shallow doses a re interpreted as the sum of the reported beta and gamma dose.
Eberline deep dose is interpreted as the reported gamma doso, sr+ 2.
Ha *shav shallow doses are interpreted as the reported TLD 1 doso.
Harshaw deep n doses a re interpreted as the reportisd TLD 2 dosa.
3.
Asterisk indicates failure to meet ANSI N13.11 criterion that /B/ + Standard
Deviation less than or equal to 0.5.
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3.
Uranium Deta Slab Source , RESL. . Delivered Dose Ebert ine Dose Ha rsti..w Dose Shaiinw Deen Dosimeter ShalIog Deep, Dosimeter Shaiiow 00e0 300
4192 191
714471 145
300
4651 165
717204 154
Blas = -0.407 . Blas = -0.502 Standa rd Deviation = 0.061 Standa rd Devia tion = 0.021 /Blas/+Standa rd Devia tion = 0.468 / Bias /+Standa rd Deviation = 0.523* , Notes: 1.
Eberline shailow doses are interpreted as the sum of the reported beta and gamma 3, r+ dose.
Ebert ine deep dose is interpreted as the reported gamma dose,
- 2.
Harshaw shallow doses are interpreted as the reported TLD 1 dose.
Harshaw deep n doses are interpreted. as the reported TLD 2 dose, g[ to
3.
Asterisk Indicates railure to meet ANSI N13.11 critorion that /B/ + Standard "" Deviation less than or equal to 0.5.
, . r1 f+
m in % 0.
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'Deta Irradiation: Cs-131 I r rad i a t ints: Be tis -Ga fnma Ra tio 20.9 . 1.
Sr-90/Y-90 Beta Point Sotorce RESL Ebertino Dose liarshav Dose polivered Dose ShaIIow D!!en Dos i metft.t ShaIIov De_ep Dos imne r Shailow Den _ 609 309 3 58 8 626 356 718 r:85 722 la64 ' 609 309 2911 687 437 7173fa9 634 451 1009 309 lif 02 932 453 7150r40 1025 667 525 717631s 1063 613-1009 309 4846 5 10:42 ' ' Blas = +0.028 +0.433 Blas = +0.074 +0.776 Standa rd Deviation = 0. 0 88: 0. 2 21 Standa rd Deviation = 0.076 0. 3 r:9 /Bla s/+ Standard Deviation = 0.112 0.657* / Bias /+ Standard Deviation = 0.150 1.125* N - c+ os Notes: 1.
Eberline shallow doses are 6:oterpreted as the sum of the reported beta and gamma F to dose.
Eberline deep dose is, interpreted as the reported gamma dose.
- s
2.
Ha.shaw shallow doses are interpr'eted as the reported TLD 1 dose. Harshaw deep (7 doses are interpreted as the reported TLD 2 dose.
r+ 3.
Asterisk indicates failure to meet ANSI N13.11 criterion that /B/ + Standard o.
Deviation less than or equal to 0.5.
- Eg.
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TI-204 Beta-Point Sou rce . RESL Del ivered Dose Eberline Dose ll.i rsli.iw Dose Shallow peep Dosimeter Shallow Deep Dosimuler Shallow Deep 609 309 3371 337 306 714:483 319 306 609 309 4258 322 322 717203 425 346 1009 309 2685 451 322 7170t4 468 341
1009 309 2778 493 324 717796 477 343 Blas = -0.496 +0.031 Bias = -0.460 +0.081 Standa rd Deviation = 0. 0887 0.027 Standa rd Deviation = 0.109 0.061 / Dias /+Standa rd Deviation = 0. 58:2* 0.058 /Blas/+Standa rd Devia tion = 0.569* O.142 . EE Notes: et 1.
Eberline shallow doses are interpreted as the sum of the reported beta and gamma $ , dose.
Eberline deep dose is interpreted as the reported gamma dose, g{ m 2.
Harshaw shallow doses are interpreted as the reported TLD 1 dose. Harshaw deep sre ,- doses a re interpreted as the reported TLD 2 dose.
i n i 3.
Asterisk indicates failure to meet ANSI N13.11 criterion that /0/ + Standard o
Deviation less than or equal to 0.5.
ee
st% (D P.+ O
tD '8 ?e .E 73 LM Un tit $
On 03 '4 % % % % O 03 Co I - -- DJ LM 40 - . .
. . 3.
Uranitem Beta Slab Soterce . RESL Delivered Dose [berline Dose lia rst..,w Dose , Shallow Deep Dosimeter Shillow Deep Dosimeter Shallow Deep 609 309 3402 465 340 717769 515 399-609 309 4887 480 329 718738 531 381 Blas = -0.224 +0.083 B ia s = -0.141 +0.262 Standa rd Deviation = 0.017 0.025 Standa rd Devia tion = 0.019 0.041 /Blas/+ Standard Deviation = 0.242 0.108 / Bias /+Standa rd Devia tion = 0.160 0.303 Notes: 1.
Eberline sha l low doses a re Interpreted as the sum of the reported beta and gamma dose.
Eberline deep dose is interpreted as the reported gamma dose.
r+ -- 2.
Harshaw shallow doses are interpreted as the reported TLD 1 dose. Harshaw deep [[ doses are interpreted as the reported TLD 2 dose, n E 3.
Asterisk indicates failure to meet ANSI N13.11 criterion that /B/ + Standard m Deviation less than or equal to 0.5.
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9 7 5 4 4
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dd n de oe sa r D rr a d dr eh a u aa w p tt m o dd s oe wr a m S nn a l n oe cs _ a aa i li l t is G t tt b al l n de n
i SS hr ai nl + g se h I -
o / n b se n _
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D d r - e r r Ld d I S Se u Er l a Re c t v n w i e . i - o D
l . e l 9 9 5 5 5 5 5 5 t . D l 0 0 4 4
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TI-20t Beta Point Sou rce .. RESL Del ivered Dose Eberline Dose liarsh.w Dose . Shallow Dee2 Dosimeter Shallow Deep Dosimeter shallow Deeg , 409 309 3586 355 199 716474 361 344
409 309 4925 307 307 718179 348 351 1645 1545 2702 1494 1494 714982 1796 1643 1645 1545 9002 1472 1472 717132 1759 1699 18t:5 1545 4986 1607 - 1607 718739 1743 1709 1845 1545 90'9 1625 1625 719274 1759 1704 2285 1545 2973 1590 1400 715732 1885 1666
ff 2245 1545 4581 1618 1618 717220 1767 1667 on Bias = -0.175-0.050 Bias = -0.073 +0.097 [ Standa rd Deviation = 0.084 0.134 Standard Deviation = 0.109 0.023 m /Blas/+ Standard Deviation = 0.258 0.184 /Blas/+Standa rd Deviation = 0.182 0.120 . et a - r3 Notes: cI 1.
Ebert ine shallow doses are interpreted as the sum of the reported beta and gamma dose.
Eberline deep dose is interpreted as the reported gamma dose.
.* 2.
Harshaw sha llow doses a re interpreted as the reported TLD 1 dose, lia rshaw deep t.
doses are interpreted as the reported TLD 2 dose, @ i c+ 3.
Asterisk indicates failure to meet ANSI N13.11 criterion that /B/ + Standard
Deviation less than or equal to 0.5.
s !f Ea .? UT LM
- 003
- 2*::
SL 8,? !R >d he >w bo u) . .
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No Iteta ' i rradia t ion: Cs-137 Camma I rrad ia t ion .: RESL Delivered Dose Ebert ino Dgse. Lia rslutw Dose Shallow Deep Dosimeter shallow Deep Dosimetor Shallow I ggg J 258 258 2321 257 257 714983 280 295 258 258 2863 267 267 718121 294 291-Bias = +0.016 +0.016 Blas = +0.112 +0.136 Standa rd Deviation = 0.027 0.027 Standa rd Deviation = 0.038 0.011 /Blas/+Standa rd Deviation = 0.043 0.043 /Bies/+Standa rd Deviation = 0.151 0.147 Notes: 1.
Eberline shallow doses are interpreted as the sum or the reported beta and gamma dose.
Eberline deep dose is interpreted as the reported gamma dose.
3, re . 2.
Harshaw shallow doses are interpreted as the reported TLD 1 dose.
Harshaw deep r+ doses are interpreted as the reported TLD 2 dose.
$ 3.
Asterisk indicates failure to meet ANSI N13.11 criterion that /G/ + Standard Deviation less than or equal to 0.5.
mr+ , O r+ O >< ,M (D r+ 3-m tD E ?+ .if bo IN Q %a =a
00 '4 n) % %% % W3 n O . ' - -s on o s e* N . S
- .
. E.
No Beta t read ia t ion: Co-60 Camrna trradiation + RESL Delivered Dose Ebertine Dose tiarstiaw Dose Shatlow Deen Dosimeter Shallow Deeg , Dosimeter Shallow peep 250 250 3204 242 242 715141 230 255 250 250 4558 242 242 718245 276 263 Bias = -0.032-0.032 .. = +0.012 +0.036 Standa rd Deviation = 0.000 0.000 Standa rd Deviation = 0.130 0.023 /Blas/+Standa rd Deviation = 0.032 ,0.032 / Bias /+Standa rd Devia tion = 0.142 0.059 Notes: 1.
Eberline shallow doses are interpreted as the sum of the reported beta and gamma 3, dose.
Eberline deep dose is interpreted as the reported gamma dose.
r+ r+ 2.
liarshaw sha t tow doses are interpreted as the reported TLD 1 dose. Harshaw de,ep $ doses are interpreted as the reported TLD 2 dose, g{ 3.
Asterisk indicates failure to meet ANSI N13.11 criterion that /8/ + Standard $ Deviation less than or equal to 0.5.
r+ r7 . O - ,US 2, 'I O
- 3 E
A .E
Ln Ln t3 t3 m- >d o3 %J CD %% 's b O
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-] r- . . . . F.
All Dosimeters Tested RESL Delivered Dose Eberline Dose Harshaw Dose Sh70 tow Egf2 Dosimeter Shallow pggg Dosimeter Shallov ' Reg 2 100
9025
26 718032 115
100
4153
0 717000
6 100
4295
0 718095
7 100
3106
37 716952 107
300
2966 308
715764 311 132 300
4008 293
719292 312 113 700
4152 678 213 717600 697 264 700
4302 807 357 715165 662 278 300
2537
0 714341
7 300
2958
0 714677
6 700
2938 109
714220 109
700
3163 152
717368 106
. 300
4192 191
714471 145
3 300
4651 165
717204 154
re 609 309 35L8 626 356 714485 722 464 g* 609 309 2911 687 437 717349 634 451 n 1009 309 4402 932 453 715040 1025 667 g[ 1009 309 4465 1042 525 717634 1063 613 m 609 309 3371 337 306 714483 319 306 m 609 309 4258 322 322 717203 425 346 r+ 1009 309 2685 451 322 717044 468 341 c5 1009 309 2778 493 324 717796 477 343 609 309 3402 465 340 717769 515 399 [[ 609 309 4887 480 329 718738 531 381 409 309 2981 358 303 713879 418 385
409 309 4899 425 335 715125 450 386 E 1645 1545 2817 1581 1581 714496 1853 1753 9o 1645 1545 4665 1764 1496 714752 1896 1853 @ 1845 1545 '4364
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