NG-87-1090, Responds to Emergency Response Facility Appraisal Rept 50-331/86-20 Open Items.Corrective Actions:Procedure for Generating Offsite Dose Projections for Unmonitored Releases Will Be Developed for Midas Dose Projection Sys

Responds to Emergency Response Facility Appraisal Rept 50-331/86-20 Open Items.Corrective Actions:Procedure for Generating Offsite Dose Projections for Unmonitored Releases Will Be Developed for Midas Dose Projection Sys

ML20206Q411
Person / Time
Site:	Duane Arnold
Issue date:	04/01/1987
From:	Mcgaughy R IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20206Q335	List: ML20206Q330 NG-87-1090, Responds to Emergency Response Facility Appraisal Rept 50-331/86-20 Open Items.Corrective Actions:Procedure for Generating Offsite Dose Projections for Unmonitored Releases Will Be Developed for Midas Dose Projection Sys
References
NG-87-1090, NUDOCS 8704210398
Download: ML20206Q411 (6)

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Iowa Electric Light and Power Company April 1, 1987 NG-87-1090 Mr. A. Bert Davis Acting Regional Administrator Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

Duane Arnold Energy Center Docket No: 50-331 Op. License No: DPR-49 Response to NRC-Inspection Report 86-020, ERF Appraisal File: A-102, A-221, A-230

Dear Mr. Davis:

This letter is provided in response to the subject special appraisal of Emergency Response Facilities (ERFs) conducted at the Duane Arnold Energy Center (DAEC) from November 17 through 21, 1986. Attachment 1 provides our response in accordance with your request. Our response is being submitted at this time under the extension granted on March 18, 1987, by Mr. William Snell of your office in conversation with Mr. David Wilson, Manager of Licensing and Emergency P1anning for Iowa Electric.

Very truly yours,

% t Richard W. McGaughy Manager, Nuclear Division RWM/GGH/pj v*

Attactinent: Response to Inspection Report 86-020 cc: G. Harper J D. Hingtgen  ;

L. Li u l L. Root R. Gilbert NRC Resident Inspector Comitment Control N0. 870026 8704210398 870414 1 PDR ADOCK 05000331 l G PDR i General Of)Tce

• P.O. Box 351 e Cedar Rapids, Iowa 52406 e 319/398-4411 $

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Attachment 1 ,

RESPONSE TO INSPECTION REPORT 86-020 .j I  !

NRC Identified Open Items ' .

a The NRC inspectors identified several instances where equipment installation was incomplete, or where modifications are deemed necessary to provide adequate assurance that the ERFs, and related equipment, are capable of supporting the DAEC Emergency Response Organization in taking adequate corrective measures in the event of a radiological energency at the plant'.

These instances are individually identified as open items in the following section.

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. Response to Open Itas

, Iowa Electric Light alid Power Co'mpany recognizes the open items identified herein constitute important concerns regarding the adequate support of the DAEC's Emergency Response Organi.zation'. As delineated below, corrective actions have been identified for severa? of the open items, while others are currently undergoing engineering evaluation. Specific details of each open item, and our response to each, are given below: p s

a Open Item 1. s .

Ensure that the following TSC equipment and systems can receive power from an essential power source:

HVAC system; radio base station for field team communications; new PI' ant Process ' Computer (PPC) '

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! (VAX model 8600); MIDAS terminal used for offsite dose calculation, ang TSC lighting.- (50-331/86020-01)

(Section 1.1.3.3) . , , ,

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Response: .

'- Iowa Electric has identified several options as appropriate action to be taken in response to this open item. These include load studies to determine if diesel generators 1G21 and 1G31 can support the additional load created by the TSC, as well as an evaluation of alternate means to provide the TSC essential power should 1G21 and 1G31 be unable to adequately suppcrt the TSC. A description of the selected action and an implementation schedule will be included in an update to this response by September 1,1987.

Open Item 2.

Ensure that the new PPC (VAX Model 8600) will be electrically isolated fram plant safety systems, and that such isolation will be adequately verified, validated, and docunented. (50-331/86020-02)

(Section1.2.2.3).

Response

The new Plant Process Computer (PPC), a VAX Model 8600, will be electrically isolated from plant safety systems by employing fiber optic communication links in a manner equivalent to the existing SPDS.

i All input to the VAX Model 8600 from the data acquisition subsystem i will be via these fiber optic links. This installation will be verified, validated, and docunented prior to startup from the current (Cycle'8/9) Refueling Outage.

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- -a Attachment 1 to JNG-87-1090 Page'Two

• However, it should be noted that the presently installed analog and digital inputs to the 4020 PPC will remain in place as part'of the VAX -

8600 installation. The acceptability..of this installation with regard to . isolation will be evaluated to determine if additional actions are i necessary. A description of any necessary corrective actions and an l implementation schedule will be included, if appropriate, in an update

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to this response by September 1,1987. ,

-Open Item 3.

Develop adequate provisions for generating offsite dose projections for releases that enter the environment through unmonitored pathways.

(50-331/86020-03) (Section 1.2.3.2).

s Response:

A procedure for. generating offsite dose projections for releases that enter the environment through unmonitored pathways will be developed for the MIDAS Dose Projection System and will be incorporated into Emergency Plan Implementing Procedure (EPIP) 3.3, and Corporate Plan Implementing Procedure (CPIP) 2.1. This action will be completed by December 31, 1987. ,

Open Item 4.

Ensure that the following six factors, which can adversely affect offsite dose calculations, are ,

corrected or are adequately compensated for:

a)' Wind speed and possible wind direction ,

measurements, for at least the northerly direction are significantly affected by meteorological tower wake effects; b) The reliability of the onsite. meteorological data-is suspect as the sensors' output signals are processed by heat sensitive equipmert kept in a structure which is not air-conditioned; c) The meteorological data reliability is suspect

! as signal conditioning equipment is not

electrically protected from power surges;.

j. d) Computerized meteorological data quality l.

control checks.are genarally too rudimentary j to identify and eliminate highly suspect 1

values;

. e)- The power-law relationship used to estimate wind speed at the offgas stack height is

!. -inappropriate; and f) . A Table in EPIP. 3.3 that could be used to

- convert a weather observation into an l-atmospheric stability c1 ass is incorrect.

l (50-331/86020-04) (Section 1.2.4.2).

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. Attachment 1 to NG-87-1090 Page Three Response: ,

Iowa Electric's response for each of the six factors affecting offsite dose calculations are as follows:

'a) Iowa Electric has: identified several options as ' appropriate action-to be taken in response to this open item. These include modification of meteorological tower boom mountings and development of computer application software.- A description of

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the selected action and an implementation schedule will be included in an update to this response by September 1,1987.

b) Meteorological system signal conditioning and data acquisition equipment is contained in the _instrunent enclosure, IC412, located in-the Intake Structure. This NEMA-12 cabinet has an internal heater to ensure the teraperature does not fall below the operational range of the equipnent, which is -32 to 120 degrees-F according to manufacturers design specifications.' The _

environmental conditions within the Intake Structure include a 40-to 104 degrees F temperature range. Since the meteorological-system equipment inside of IC412 generates heat, the internal cabinet- temperature can be expected to be higher. than the anbient temperature within the ' Intake Structure.

To accurately verify the operational temperature of the equipment in question, the internal temperature of instrunent enclosure IC412 will be monitored and recorded for the period of time from May 1, 1987 through September 30, 1987. Based upon this:

temperature study, appropriate actions will be identified. A description of the selected action and an implementation schedule will be included in an update to this response by September 1, 1987. However, should ongoing review of temperatures within 1C42 indicate the operational range of the equipment may be surpassed, appropriate actions wil_1 be taken immediately to ensure the operational range of the equipment is not exceeded.

c) The upgraded meteorological system is powered from two separate power sources in the intake structure. The primary power source is supplied from an essential power bus through a dedicated step-down transformer and circuit breaker. The - step-down transfonner and the circuit breaker are wall mounted and physically located approximately 10 feet from IC412. The backup power source is supplied from a lighting distribution panel in the intake structure. Both power sources feed an automatic transfer switch provided in IC412. Nonnally, the meteorological system power is supplied by the primary power source and .is automatically transferred to the backup source upon loss of primary power. When

the primary power source is restored, the power is automatically -

transferred back to the primary power source.

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Attachment to

- NG-87-1090

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. Page Four 3--

4 Since IC412'is primarily powered from a source fed by an essential -i bus, which in turn feeds a dedicated step-down transformer and circuit breaker, the potential for damaging the meteorological system due to power surges is mitigated. The backup power source- l could be susceptible to power surges, but this power source is .l only used when the primary source is not available. The primary i power source was selected due to its reliability and availability. .I i

Therefore, providing surge protection for the backup power source- '

is not considered warranted. I 1

d) SPDS algorithms for the comparison of ' wind speed, wind direction, temperature, temperature difference (AT), and sigma theta, will be modified to include more stringent comparison limits.

Additionally, an appropriate comparison limit for comparing-

! real-time data to averages of previously validated values will be i included in the algorithms, with appropriate justification for the

use of the comparison limits selected.

l This corrective action will be implemented in conjunction with

! actions. implemented with Open-Item 4a) above.

I i e) The power law relationship used by the MIDAS Dose Projection i System currently incorporates values more appropriate to' urban

areas. These values will be revised to reflect a rural

) environment. This will be completed by December 31, 1987.

!- f) The table in EPIP 3.3 and CPIP 2.1 used to convert standard .

l weather observations into an atmospheric stability class will be i revised to be an accurate translation of the original table

developed by Pasquill as modified by Gifford. This will be completed in conjunction with open item.4e) above.

Open Item 5.

Develop procedures and provide elated training to appropriate emergency response perso7ael to enable

. them to retrieve and display historical plant data -

L that are stored using the PPC or SPDS.

l (50-331/86020-05) (Section 1.2.5.1).

Response

The method by which historical plant data can be retrieved and displayed by use of the PPC, or the SPDS, will be identified. This

! will be incorporated into the appropriate procedures by

December 31, 1987. Training of appropriate emergency response

personnel regarding this retrieval and display methodology will be completed by March 1, 1988.

Open Item 6.

Establish and maintain an availability log for the present and the new PPC. (50-331/86020-06) (Section 1.2.6).

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' Attachment 1 to NG-87-1090 Page Five

Response

An PPCavailability (GE-PAC 4020 ) log andwill'be the newestablished andatmaintained PPC (VAX 8600) the beginningfor the existing of their parallel run scheduled to commence prior to startup from the current (Cycle 8/9) Refueling Outage.

Open Item 7.

Establish and maintain a sensor through computer calibration process for the PPC. (50-331/86020-07)

(Section 1.2.6.1) .

Response

A sensor through computer calibration process for the new PPC, a VAX 8600, will be evaluated to determine appropriate action in response to this open item. A description of the selected action and an implementation schedule will be included in an update to this response by September 1,1987.

I Open Item 8.

Proceduralize guidance related to the evacuation and relocation of OSC personnel, including specifying: what criteria warrant OSC evacuation; which supervisory and staff personnel would -

relocate to the TSC, ORRA, or some other location; and how OSC personnel . accountability would be maintained during such a relocation.

(50-331/86020-08) (Section 2.1.1.3).

Response

Guidance related to the evacuation and relocation of OSC personnel, including criteria warranting OSC avacuation, relocation areas for OSC supervisory and non-supervisory personnel, and how OSC accountability will be maintained during a relocation will be appropriately reflected in revisions to EPIP 2.1 " Activation and Operation of the OSC," and EPIP 1.3 " Plant and Site Evacuation". These revisions will be completed by December 31, 1987.

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