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Forwards Special Rept 81-04 for Two Separate Occasions When Reactor Thermal Power Changed by More than 15% of Rated Thermal Power within 1-hr
	ML20049H461
Person / Time
Site:	La Crosse File:Dairyland Power Cooperative icon.png
Issue date:	02/19/1982
From:	Linder F; DAIRYLAND POWER COOPERATIVE
To:	James Keppler; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
	LAC-8102, NUDOCS 8203030085
	Download: ML20049H461 (7)
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PO BOX 817 2615 EAST AV SOUTH. LA CROSSE. WISCONSIN 54601 (608) 788 4 000 F eb ru a ry 19, 1982 In reply, please refer to LAC-8102 00CKET NO. 50-409 Mr. James G.

Keppler, Regional Director go) up rs V.

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SUBJECT:

DAIRYLAND POWER COOPERATIVE

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SPECIAL REPORT 81-04 X-gv R E F E '.; E N C E :

(1)

LACBWR Technical Specifications Section 4.2.2.22, Action 9

Dear Mr. Keppler:

In accordance with the provisions of Reference (1), a Special Report is submitted covering results of sampling and analysis actions together with additional operational information for two separate occasions when reactor thermal power changed by more than 1b% of Rated Thermal Power within one hour while in Operational Condition 1 or 2.

The separate occasions are discussed in sections as follows:

SECTION 1-----November 12, 1981 SECTION 2-----December 23, 1981 Each section provides a summa ry of operating data and radiological data for the time period prior to the thermal power change along with the results of the additional sampling required.

If there are any questions concerning this report, please contact us.

WP-1 FEB 2 2 593 8203030095 820219 PDR ADOCK 05000409 ZE28s S

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Mr. James G.

Keppler, Regional Director F eb ru a ry 19, 1982 U.

S.

Nuclea r Regulatory Commission LAC-8102 Very truly you rs,

d Frank Linder, General Manager FL:LSG:eme ATTACHMENTS CC:

Director, Office of Inspection and Enforcement (30)

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Nuclea r Regulatory Commi ssion Washington, D.

C.

20555 Director, Office of Management, Information, and Program Control (3)

U.

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Nuclear Regulatory Commission Washington, D. C. 20555 Resident Inspector WP-1 PECIAL REPORT 81-04 INTRODUCTION LACBWR Tech ni ca l Specifications, Section 4.2.2.22, Action g, requires sampling and analysis for Iodine-131, -133, and -135, as well as gross beta and gamma activity between 2 and 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months following a thermal power change of greater than 15% of rated thermal power within one hour.

This special report is required to contain the information determined by the analysis plus additional information regarding reactor power history, fuel burnup, cleanup flow history, offgas activity levels, and gross alpha activity levels.

SECTION 1 On November 12, 1981, at 0831, the reactor automatically shutdown due to a high flux spike occurring cn Nuclear Instrumentation (NI)

Channel No. 7 while the monthly Technical Specification Test was being performed on NI Channel No. 5, which involves inserting a scram signal.

The spike provided the second trip signal to satisfy the 2 of 4 scram logic.

GROSS 8-y ACTIVITY AND 10 DINE ANALYSIS Time of Sample:

1106, 11/12/81 Sample Results:

Gross 8-y-----------0.362 uCi/ml I-131---------------4.14 x 10-3 uCi/ml I-133---------------1.68 x 10-2 pCi/ml I-135---------------1.84 x 10-2 pCi/ml ADDITIONAL INFORMATION (1)

Reactor Thermal Power Level starting 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months prior to thermal power change:

0800, 11/10/81 - 0831, 11/12/81-------93%

(2)

The approximate fuel burnup of assemblies in a symmetrical core region is shown in Figure 1.

(3)

Cleanup Flow History starting 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months prior to the thermal power change:

P ri ma ry Purification Flow Rate 0800, 11/10/81 - 0831, 11/12/81-------41 gpm 1-

SPECIAL REPORT 81-04 Primary Purification Decontamination Factors (S-y)

0142, 11/12/81------------------------348:1

0029, 11/16/81------------------------297:1 (4)

Offgas Activity Levels for 48 Hours Prior to Thermal Power Change:

0800-1600, 11/10/81----------------------168 C1/ day 1600-2400, 11/10/81----------------------231 Ci/ day 0000-0800, 11/11/81----------------------232 Ci/ day 0800-1600, 11/11/81----------------------233 Ci/ day 1600-2400, 11/11/81----------------------228 Ci/ day 0000-0800, 11/12/81----------------------225 Ci/ day (51 Gross Alpha Activity Level Starting With Sample Prior to Thermal Power Change:

0142, 11/12/81---------------------------<6.76 x 10-8 pCi/ml

0831, 11/12/81--------------------------- Thermal Power Change

0028, 11/16/81---------------------------1.704 x 10-7 uCi/ml SECTION 2 At 2115 on December 23, 1981, the reactor automatically shutdown from 85% Reactor Rated Thermal Power.

GROSS 0-1 ACTIVITY AND IODINE ANALYS($

Time of Sample:

0021, 12/24/81 Sample Results:

Gross S-Y-----------0.106 pCi/ml 1-131---------------1.40 x 10-3 pCi/ml 1-133---------------6.56 x 10-2 uCi/ml 1-135---------------9.47 x 10-2 pCi/ml l

ADDITIONAL INFORMATION l

(1)

Reactor Thermal Power Level starting 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months prior to thermal power change:

2100, 12/21/81 - 2115, 12/23/81--------85%

(2)

The approximate fuel burnup of assemblies in a symmetrical core region is shown in Figure 2.

(3)

Cleanup Flow History starting 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months prior to thermal power change:

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SPECIAL REPORT 81-04 Primary Purification Flow Rate 2100, 12/21/81 - 0600, 12/22/81-------41.0 gpm.

0700-2300, 12/22/81-------------------40.5 gpm.

2400, 12/22/82 - 2115, 12/23/81-------41.0 gpm.

P ri ma ry Purification Decontamination Factors (8-y)

0134, 12/21/81------------------------322:1

0144, 01/04/82------------------------365:1 (4)

Offgas Activity Levels Starting 48 Hours Prior to Thermal Power Change:

1600-2400, 12/21/81----------------------209 Ci/ day 0000-1600, 12/22/81----------------------208 Ci/ day 1600-2400, 12/22/81----------------------212 Ci/ day 0000-1600, 12/23/81----------------------210 C1/ day (b) bross Alpha Activity Level Starting With Sample Prior to fhernal Power Change:

0130, 12/21/81---------------------------<3.38 x 10-8 pCi/ml

2115, 12/23/81---------------------------Thermal Power Change

0145, 01/04/82---------------------------1.16 x 10-7 pCi/ml __

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AN INDICATION OF REGIONAI CXPDFURE AS OF NOVEMBER 9, 1981 Tile AVERAGE EXPOSURE:

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AN INDICATION OF REGIONAL EXPOSURE AS OF DECEMBER 10, 1981 Tile AVERAGE EXPOSURE: 11.355

ML20049H461

Text

SUBJECT:

Dear Mr. Keppler:

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