ML071350106

Meeting Handout on CRDM Canopy Seal Clamp Installation

ML071350106
Person / Time
Site:	Summer
Issue date:	05/02/2007
From:	SCANA Corp, South Carolina Electric & Gas Co
To:	Office of Nuclear Reactor Regulation
References
Download: ML071350106 (10)

Text

CRDM Canopy Seal Clamp Installation:

• Discovered Two Lower Canopy Seal Welds Leaking

• Installed Canopy Seal Weld Clamps on Both

• Cleaned Reactor Vessel Head

Secondary FAC Inspections:

• Inspected 62 Locations

• Repaired Large Heater Drain System Valve due to Cavitation

CW Pump Casing and Supports:

• Two Pumps Required Some Level of Repair

• One Repaired in Place

• One Refurbished Offsite

Feedwater Booster Pump Repairs:

• End Of Life Seal Replacement on C

• Proactive Seal Replacement on D

• Inspection of Both Casings

• Installation of New Rotating Assemblies

RF16 Outage RP and Exposure Performance V. C. SUMMER NUCLEAR STATION Paul Mothena Manager, Health Physics and Safety Services

Summary of HP Performance during RF16

• Pre-Outage Working Goal 70 Rem

- Total planning dose (RWP totals)

• Extremely successful RCS Cleanup

- Use specialty resins for 7 cycles

- Peak Co58 0.151 uCi/ml

RCS Co-58 Concentrations During Past Refueling Outages at VCSNS Time Normalized to Time of Peak Concentration 1.00E+02 1.00E+01 C0-58 Concentrations, uCi/ml 1.00E+00 1.00E-01 0.151 uCi/ml All RCPs Off 1.00E-02 0 20 40 60 80 100 120 Elapsed Time (Hrs)

Benchmark Dose Rate for Outage Dose Goal

• Avg. of 8 general area dose rates RB - 412 *Electronic Dosimeters

• Correlates to total outage dose

• Since RF10 PRT C

4 2 A S/G C S/G 7 3 A

1 6

B Accum 5

A Accum B

B S/G 8

Benchmark Dose Rate vs Total Outage Dose RF 10 180 160 140 Total Outage Man-Rem RF 11 RF 12 120 100 RF 9 RF 14 RF 15 80 RF 13 RF16 60 40 20 0

50 48 46 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Benchmark Dose Rate (mR/hr)

History of Benchmark Dose Rates During Cooldown 40 RCP Off 35 30 Benchmark Dose Rate, mR/hr RF 12 25 20 RF 13 15 RF 14 RF 15 9.1 mR/hr 10 RF 16 5

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 Hours After M ode 3