ML17201J330

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Forwards Charter Developed for Insp of Events Associated W/ Plant 880516 & 17 MSIV Testing Failures.Charter Prepared Per NRC Incident Investigation Manual & 871002 Draft Augmented Insp Team Implementing Procedure
ML17201J330
Person / Time
Site: Dresden Constellation icon.png
Issue date: 05/20/1988
From: Greenman E
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To: Dupont S
NRC
Shared Package
ML17201J328 List:
References
NUDOCS 8807120023
Download: ML17201J330 (11)
v • d • e


Text

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UNITED STATES NUCLEAR REGULATORY COMMISSION REGION 111 799 POOSEVEL T ROAD GLEN ELLYN, ILLINOIS i01l7 MAY 2 0 ~oo MEMORANDUM FOR:

S. G. DuPont, Team Leader, Dresden Augmented Inspection Team (AIT)

FROM:

Edward G. Greenman, Director, Division of Reactor Projects

SUBJECT:

AIT CHARTER Enclosed for your im;lementation is the Charter developed for the inspection of the events associated with the Dresden MSIV testing failures which occurred on May 16 and 17, 1988. This Charter was prepared in accc"'Clance with the NRC Incident Investigation Manual and the draft AIT implementing procedure issued for use on October 2, 1987.

As stated, the objectives of the AIT are to corrmunicate the fac:s surrounding this event to regional cr,:j headquarters management, to identify and communicate any generic safet1 concerns related to this event to regional and headquarters management, an~ to document the findings and conclusions of the onsite inspection. If you have any questions regarding these objectives or the enclosed Charter, please do not hesitate to contact either myself or M. Ring of my staff.

Enclosure:

AIT Char~er cc w/enclosure:

A. B. Davis, RIII C. J. Paper i e 11 o, RI : I F. Miraglia, NRR C. Rossi, NRR G. Holahan, NRR W. Lanning, NRR L. Norrholm, NRR J. Clifford, EDO H. Ornstein, AEOD H. Mi 11 er, DRS I)

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of Reactor Projects Dresden Resident Ins:>ector Office Quad Cities Resident Inspector Office

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PDC ATTACHMENT 2

Dresden MSIV Failure to Close on Loss of Air Augmented Inspection TEa~ (AIT) Charter Investigate:

1.

Failure of MSIVs to close fully on loss of air during conduct of special test procedure.

2.

Safety Significance, Root Cause(s).

3.

Interaction of prior maintenance activities to the event.

4.

Safety implications if slow leaks in the air supply had occurred.

5.

History of any previous problems.

6.

Broader Implications e.g. other systerr.s, other valve/components.

7.

Event Reporting

8.

Conclusions.

Questions for Dresden AIT I.

Failure of MSIVs to close (May 16 and 17, 1988) fully on loss of air during conduct of special test procedure.

~.l What was the sequence of events?

!.4 Is there a history of any previous problems (e.g. 12/24/87 event, etc).

2.

Safety Significance, Root Cause(s).

2.1 Was there any immediate safety si;:r.ificance from this event? If so, what was significant?

£.2 What was the root cause of the event?

3.

Interactions of maintenance activitie~ to the event.

3.1 What is the past and present mair.t.Enance1iistory of the MSIVs?

3.2. What is the maintenance history er the Station Air (SA) and Drywell Pneumatic Systems?

~.3 What testing was perfotmed as thE result of maintenance activities?

3.4 What is the material* ~ondition of the affected valves and i~ter connected instrument" air and control systems as *it would affect the valve closure function?

4.

Safety implications if slow leaks in~~~ supply had occurred.

C.l. Does the licensee have procedures in place to handle this event?

L.2. Are they adequate?

L.3. Have the operators been trained er them.?

C.4 Does the accident analysis bound t~is event?

(.5 What actions were taken by the Op~ators?

~.6 Was the event properly categorize~:

t.7 Was the event reported as requir~:

l.8 Evaluate the adequacy and meanin~:~ lness of this slow air bleeddown type test.

5.

History of any previous problems.

5.1 Have there been previous events similar to this?

5.2. If there were previou.s events was the licensee aware of therr.?

5.3 If not, why not?

5.4 Is there information available on other similar events?

5.5. Have there been any IEIN's or IEB's issued on similar subjects?

5.6 Is there information available from other sites of similar problems?

6.

Broader Implications.

6.1 Is a IEIN or IEB warranted or a result of this event?

6.2 Are there other valves or instruments that require investigation?

6.3 If the problem lies external to the MSIV's, are there generic implications? e.g. for othe.r plant systems or other plants with same components.

7.
  • Conclusion.

7.1 What corrective actions are proposed, and are they adequate?

7.2 Examine generic implications to other plants and advise ~R~

management subsequent to the site inspection.

7.3 Document inspection findings in accordance with draft manual chapter 0325.

2

LEGEND 1.- 4 WAY VALVE (controlled by 6.)

2 - 4 WAY VALVE (controlled by 4. and 5.)

3-AIR STORAGE TANK (BY OTHERS) 4 - 3 WAY VALVE (shown energized) 5 - 3 WAY VAL VE (shown energized) 6 - 3 WAY VALVE (shown de-energized) 1-SPEEO CONTROL VALVE 8 - HYDRAULIC CYLINDER 9 - SWING CHECK VALVE (BY OTHERS)

E-EXHAUST SLOW SPEED EXERCISING CIRCUIT 120V SOL 120V SOL.

125V-DC SOL.

ATTACHMENT 3 (MAIN VALVE SHOWN IN OPEN POSITION)

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AIR CYLINDER ON MAIN VALVE FLOW

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AIR SUPPLY MAIN STEAM ISOLATION VALVE -CONTROL DIAGRAM

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FILTER 2A INSTRUMENT AIR COMPRES SON TO CRIB HOUSE TO FLOOR DRAIN SYSTEM RADWASU BLDG 1----u---._TO RADWASTE INSTRUMENT AIR HEAl;lER TURBINE BLDG I REACT: BLDG TO U-l..--.... 11---1 TO REACTOR BLDG INSTRUMENT INSTRUMENT AIR UEADER AIR FROM UNIT-I INSTRUMENT AIR

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