ML13066A331

Regulatory Conference Presentation 3-12-2013

ML13066A331
Person / Time
Site:	Kewaunee
Issue date:	03/07/2013
From:	Dominion Energy Kewaunee
To:	NRC/RGN-III/DRMA
References
EA-12-272
Download: ML13066A331 (20)

Text

Kewaunee Power Station NRC Region III Regulatory Conference Loss of PPCS Indication For SPING RMs

© 2007 Dominion

Agenda g

• Opening p g remarks

• Event description

• Regulatory R l t significance i ifi

• Conclusion

• Closing remarks 2 © 2007 Dominion

Opening p g Remarks Dominion is committed to preserving the health and safety f t off the th public bli 3 © 2007 Dominion

Opening p g Remarks

• Preliminaryy Violation

• 10 CFR 50.54 (q)(2) & 10 CFR 50.47 (b)(4)

- Kewaunee Power Stations unidentified loss of SPING indication on the PPCS and RADSERV stations precluded action to restore the capability p y to classify y EALs RG1.1 and RS1.1

• Agree performance deficiency existed

• Differ with significance of finding 4 © 2007 Dominion

Event Description p

• Hardware failure

• RADSERV

• Interface between SPING units and PPCS

• Additional Data Acquisition Modules lost

• Local SPING indication remained available

• Upon discovery of RADSERV failure, restoration completed same day 5 © 2007 Dominion

Regulatory g y Significance g

RADSERV failure- Hardware issue P i Previous hardware h d failures f il have h been b

evaluated under 10 CR 50.47(b)(8) 50 47(b)(8) 6 © 2007 Dominion

Regulatory g y Significance g

5.8 10 CFR 50.47(b)(8), Emergency Facilities and Equipment PLANNING STANDARD:

• Adequate emergency facilities and equipment to support the emergency response are provided and maintained.

PS FUNCTIONS: 1. Adequate facilities are maintained to support emergency response.

2. Adequate equipment is maintained to support emergency response.

7

Regulatory g y Significance g

• NUREG 0654

• H. Emergency Facilities and Equipment

• 5.b. radiological monitors, (e.g., process, area, emergency, effluent, wound and portable monitors and sampling equipment);

8 © 2007 Dominion

Regulatory g y Significance g

10 CFR 50.47 (b)(8)

( )( )

• White threshold

- Equipment necessary to implement the E-plan is not available or not functional

• Period of longer than 7 days from time of discovery y

• Without Compensatory Measures 9 © 2007 Dominion

Regulatory g y Significance g

10 CFR 50.47 (b)(8)

( )( )

• Green threshold

- A significant amount of equipment necessary to implement the E-plan is not available or functional to the extent that any key ERO member could not p perform his/her assigned g

functions, in the absence of compensatory measures.

10 © 2007 Dominion

Regulatory g y Significance g

IMC 0609 Basis Not all hardware Assessed by scope of failures under control outage from of licensee y discovery

• RADSERV failure

• Restored same day

• Hardware failure of discovery 11 © 2007 Dominion

Regulatory g y Significance g

• Industryy OE

• Columbia Generating Station (05000397/2012502)

Fi di Finding St d d Standard Si ifi Significance Effluent Monitor Classification 10 CFR 50.47(b)(4) White Thresholds Inaccurate methods for assessing the 10 CFR 50.47(b)(9) White offsite consequences of a radiological release were inaccurate Reactor Building High Range 10 CFR 50.47(b)(8) Green - Licensee Identified Exhaust monitor was unavailable 38 of 149 months and corrective actions were ineffective in restoring the availability and reliability of the monitor 12 © 2007 Dominion

Regulatory g y Significance g

• Columbia Green Findingg

• 10 CFR 50.47 (b)(8)

• Failed to provide and maintain RX Building High Range Exhaust RM

• Unavailable 38 out of 149 months

• Planning Standard determined to be degraded

• Causing C i potential t ti l delays d l

• Classification and radiological assessments 13 © 2007 Dominion

Regulatory g y Significance g

• Columbia White Findingg

• Finding

• 10 CFR 50.54(q) and 10 CFR 50.47(b)(4)

• Failure to maintain a standard EAL scheme

• Inappropriately calculated and changed RM thresholds for Site Area Emergency and General Emergency 14 © 2007 Dominion

Additional Information

• Actual duration of vulnerabilityy

• Fast breaking LOCA

• RCS > 350 350°F F on 3/24/11 at 0300

• Six days

• Classification Methodology

• Shift Manager perspective 15 © 2007 Dominion

Additional Information

• EAL scheme diversification

• NEI 99-01 Rev. 4

- Fission product barrier challenges

- Effluent ICs do not stand alone

- EOPs and CSF reduce ambiguity and time

• NRC Regulatory Analysis of NEI 99-01

- Plant conditions more timely than radiological measurements 16 © 2007 Dominion

Root Cause Evaluation RC-1 Absence of a programmatic requirement to pe periodically od ca y monitor o to RADSERV S V aand d PPCS RC 2 RC-2 System platform is obsolete and difficult to maintain 17 © 2007 Dominion

Conclusions

• RADSERV failure was a hardware issue

• Restored same day as discovery

• 10 CFR 50.47 50 47 (b)(8) Green Finding

• Precedence of the Columbia finding 18 © 2007 Dominion

Closing g Remarks

• Dominion Acknowledges g

• Degraded planning standard

• Importance of equipment associated with EP

• Violation has occurred

• Corrective actions 19 © 2007 Dominion

Closing g Remarks Dominion is committed to preserving the health and safety of the public 20 © 2007 Dominion