ML17187A888

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Discusses 970228 pre-decisional EC in Lisle,Il Re Actions Re Identification Degraded Control Room Ventilation Sys Performance at Facility
ML17187A888
Person / Time
Site: Dresden  Constellation icon.png
Issue date: 03/26/1997
From: Hiland P
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To: Jamila Perry
COMMONWEALTH EDISON CO.
References
EA-96-532, NUDOCS 9704040089
Download: ML17187A888 (23)
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Text

,.

i EA 96-532 Mr. J. S. Perry Site Vice President Dresden Station

  • Marcil 26 I 1997 Commonwealth* Edison Company
  • 6500 North Dresden Road Morris, IL 60450 SU~JECT:

DRESDEN PRE-DECISIONAL ENFORCEMENT CONFERENCE

Dear Mr. Perry:

rE,*01 This refers to the meeting conducted at the _NRC Region Ill Office in Lisle, Illinois on February 28, 1997. The meeting was to dis.cuss your actions related to the identification of degraded control room ventilation system. performance at the Dresden station. This issue is discussed in detail in Inspection Report 50-237;249/96014, dated February 14, 1997. The.

topics discussed at the meeting included our findings and your related corrective actions, both completed and planned.

In accordance with 1 o* CFR 2. 790 of the NRC's "Rules of Practice," a copy of this letter and

  • its enclosures will be placed in the NRC Public Document Room (PDR).
  • We appreciate your cooperation in this matter. *
  • If you have an_y questions regar~ing this meeting, please contact me at 630/829-9603.
  • Docket No.. 50-237
  • Docket No. 50-249

Enclosures:

1.

Partial ~ist of Attendees

. Sincerely,

/s/ P. L. Hiland Patrick L Hiland, Chief

. Reactor Projects Branch 1

2.

Licensee Presentation,_ Dresden Control Room Ventilation Pre-decisional Enforcement Conference DOCUMENT NAME: A:\\ENFCONF.ORE To receive e copv of thia document, indicate in the box *c*

  • Copy Without llttech/.,d -e*
  • Copy with attech/.,d "N"
  • No copy OFRCE Riii NAME Hil-.d/co DATE 3/J-i /97 9704040089 970326 PDR ADOCK 05000237 G

PDR

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J. cc w/encl: T. J. Maiman, Senior Vice President Nuclear Operations Division D. A. Sager, Vice President, Generation Support

  • _

H. W. Keiser, Chief Nuclear Operating Officer T. Nauman, Station Manager Unit I.

M. Heffley, Station Manager Units. 2.and 3 F. Spangenberg, Regulatory Assurance Manager **

I. Johnson, Acting Nuclear Regulatory Services Manager*

Richard Hubbard Nathan Schloss, Economist Office of the Attorney General State Liaison Officer

- -Ch airman, 11 l i no is Commerce Cammi s s ion

.. D~cument Control Desk-Licensing. -:

Distribution:

Docket File w/encl PUBLIC IE-01 w/encl OC/LFDCB w/enc.l SRI LaSalle, *Dre~den, Quad C:ities.w/encl RACl {E-Mail)

Deputy RA, w/encl TSS w/encl J. Goldberg, OGC w/encl Project Manager, NRR w/encl DRP w/encl Rill PRR w/encl CAAi w/encl {E-Mail)

A. B. Beach, w/encl Rill fnf. Coordinat~r, w/~ncl.

DRS. (3) w/encl J. Lieberman, OE w/encl

  • R. Zimmerman, NRR w/encl

..a.

ENCLOSURE 1 DRESDEN PRE-DECISIONAL ENFORCEMENT CONFERENCE

  • FEBRUARY 28, 1997 LIST OF ATTENDEES Couunonwealth Edison CComEdl J. S. Perry, Dresden Station Site Vice President J. M. Heffley, Dresden Station *Manager R. D. Freeman, Dresden Station Site Engineering Manager F. A. Spangenberg, Dresden Regulatory Assurance Manager Nuclear Regulatory Conunission
  • A. B. Beach, Regional Administrator, Rill J. A.* Grobe, Deputy Director, Division of Reactor Projects, Rill

. P.**L. Hiland~ Chief, Reactor Projects Branch 1, Rill H. B. Clayton, Enforcement Officer, Rill R. A. Capra, Director, Project.Directorate 111-2, NRR.

. J. S. Stang, Dresden Senior Project Manager, NRR

I

'I' ENCLOSURE 2.

. *ComEd*.

DRESDEN STATION

~*

~-

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..~41D~n--~~o~*.*

.. ~~

Ven * *on Predecisional

... Enforceme,at Conference

  • ***.**.. ****** * ** February 28, 199'7

.. *. **.**... *. NRC Region III

-~.....

ComEd**

. Agenda DRESDEN STATION

  • .: J. S. Perry

. - Opening Remarks

  • . R. D. Freeman

- Chronology, Safety Significance,. Root Cause, and Corrective Actions *

  • J. S. Perry Closi~g I'

ConiEd.

Opening Remarks DRESDEN STATION WMMMMM&*t>>M¥&M¥bRMSW~aamrwa~~~111e 1#¥*mw4;;1i.Wli4§iili¥M...-m--i I'

. *. ComEd Acknowledges the Violation

. -~*Failure to Perform Post-Modification resting of Control Room (CR) Heatin_g, Air Conditioning, and Ventilation *(HVAC) System*

  • Identified While Performing Post-**
  • M6dificationTest Review.for Past CR*

HV AC Modifications :.. *

{,...

- Notified Quad Cities

      • Prompt Delibera.te Action Onceldentified.*

ComEd Background

  • DRESDEN STATION

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  • Installation of CR B Train HV AC-1982. *
  • - Post Mod. Test Comp.leted_** *

- Post Mod Test Did Not Verify +1/8" w.g. With Respect to Adjacent Areas..

  • Four Additional Mods to CR Boundary -

1988 to 1993 *

- Post Mod Testing Deferred Based on Performance of Routine *surveillance Routi~e Surveillance Did Not Identify

ComEd****

Background.

DRESDEN STATION

~** ~

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  • .Installation of CR B Train HVAC-: 1982
  • 9

.. - Post Mod.Test Completed *. *. -

  • -.Post Mod TestDidNot.Verify+l/8"*w.g.With Respect to* Adjacent.Areas c. Four Additional Mods to CR Boundary.~ *
    • .1988to1993

- Post Mo*a* Testing De.ferred Based on

  • -.*Performance* of* Rou~tine Surveillan*ce

- Routine Surveillance Did N oJ Identify

  • Inadequately Sea.l.e*a.~Penetrations *.. **.*.

ComEd

  • Background**..

DRESDEN STATION

  • . Efforts to* Close Modifications Started* 1993

- Manage~ent.su.pport Inadequate*

  • . Preliminary Testing Performed for Baseline Information

- Tests Were Inadeql}_ate*and Results Were Not Properly Evaluated

  • ComEd Discovery and Actions***.**.

DRESDEN STATION

--~'"'"

. I

  • . During Modification Close-Out Effort CR
  • e Mods Determined to be Outliers (9/26/96) *
  • Engineers Identified Air Flow Into CR.

When CR Should Have Positive Pressure

  • *Problem Identification Form (PIF) Writteft.

to* Inve*stigate..

e.

~

ComEd.

  • Discovery and Actions * *

. DRESDEN STATION Jl1':'.'1'f*

  • Dresden Notified Other ComEd 1Sites.
  • ENS Call Made to Report Condition (10/8/96)

- Could Not Maintain CR at Positiv.e Pressure During Normal Operations, Nor Meet +*l/8*w.g.

. : in Emergency Mode.

  • ComEd
  • Actions DRESDEN STATION

. *. Developed Plan to Restore CR Boundary to

  • e
  • Original Design (10/8/96-10/21/96).. *

. - Performed Testing to Determine As~found Condition *of CR * *

-~ Eng.ine~ri~g* _and *Maintenanc~ Team f orined~.*.. "

- Commenced Sealing to Restore CR Emergency Zone.

- Temporary Alte.ration"Removed Aux. ".

Computer* Room from CR Emergency Zorie * *

  • 1' ComEd
    • Actions*.

DRESDEN STATION

.. I I'

Degraded (10/21/96).*

-.CR Pressurization Requirements Not Met : *

~ Measured In-Leakage Within Analytical Bounds

- Operability Analysis Based on Standard.

Review Plan 6.5.5 Methodology.

- Operator :Thyroid Dose Less Than* 30 Rem

ComEd**

Actions**

DRESDEN STATION

  • . Technical Specification Upgrade Project. * * *
  • e
  • Implemented (1/15/97) *

. - Entered Limiting. Condition for Operation*. <!....

(LCO) for CR HV AC

- *Anticipated Shutdown: of *Unit 2 if LCO Could.

Not.Be Met

e.

ComEd

        • Actions
  • DRESDEN STATION

~ -.

  • e Concerns (1/21/9*7) _

. - Test Determine-d CR Emergency Zone. * *

. *Maintained Positive Pressure iii Normal Mode, and ~ 1/8" w.g. With Respect. to Sun;ounding Areas in Emergency *Mode

- In-Leakage Verifie~ -Within UFSAR.Criteria

  • _ - Analyzed Dose to Operators in Accordance

_ With ~icens.ed Methodology**

  • I
  • 1, ComEd.. Current Statlls - CR HV AC.

DRESDEN STATION

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    • *..
  • Sealing Completed~ CR Boundary Restored
    • Flow B*alancing.. in.. Progress_

, *.***.*.Aux~ Comf)uterRoon1ReIIlovedfrom CR..

.. :. *.*Emergency Zorie *

. ComEd Safety Significance DRESDEN STATION fr,U"f

  • .No Adverse Impact to Health.and Safety of the *e Public
  • No Adverse*Impact to Operators for Design Bases Accidents

- SRP 6.5.5 Methodology" :..

- SBGT Charcoal Efficiency *.

  • - *As-Found Inleakage Acceptable

'w ComEd Safety Significance *..

. DRESDEN STATION..

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  • . Potential to Exceed GDC 19. Criteria for the *

.. e

  • Op~rators (LER 95~007) *. *..

., * * *. Operator Accident Mitigation Actions Could Still Have Been.Performed

  • Issue Is* Significant

'ComEd' ETB Ventilation DRESDEN STATION

  • Unsatisfactory Material Condition-1/96
  • Plan Developed to Res.tore ETB Ventilation

.* 4/96 - UFSAR Revised to Show ETB

. Positive Relative to Adjacent Areas

  • 10/96*- ETB Negative,. *neclared Operable
  • but Degraded *
    • Piping and Valve Replacement and Final Balancing Required *... * *

\\

  • 1 I

\\

... 1' ComEd

  • Root Causes DRESDEN STATION

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  • . Inadequate Management Oversight.* *
  • I

-. ComEd Oversight of AE Activities Lacking

. - Living wi(h Backlogs

- Inadequate *Problem Identification Process

  • Inadequate Design Control and
  • Configuration Management

- *Post Modification *Test Deficiencies

  • ComEd. CR HVAC Corrective Actions**.

DRESDEN STATION

.,,.~.

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  • . Repairs *complete :
  • Pressurization Requirements *V erifie~
  • *. Surveillance Procedure Revised
  • CR DP lnstrllment Repaired.
  • Design Drawings to be Updated *
  • Original Test Engineer Qualifications*.

Revoked.

~.I ComEd Corrective Actions DRESDEN STATION

.9~

I'

  • Management Oversight *

. - Improved* AE Oversight ** * *... -*

~"-*Open* Mod Closure..... *.**"*>""*:.*_*:. * -~.. <

~ Eri1:1anced Problem.Identification*.**. *.

  • *
  • Design and Configuration Management
  • - PostMod TestingIIllproVements

- *Verification of Existing *surveillan_ces"":*

  • """' Interlace with Quad Cities* < *....

CONTROL.ROOM HVAC SYSTEM AUX. COMPUTER ROOM DRE~DEN STATION UNITS 2, 3, & 1 COMMONWEAL TH EDISON CO.

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