ML21067A201

Drainage Ditch Flood Timeline

ML21067A201
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	02/10/2021
From:	ZionSolutions
To:	Office of Nuclear Material Safety and Safeguards
Shared Package
ML21067A225	List: ML21067A176 ML21067A177 ML21067A178 ML21067A179 ML21067A180 ML21067A181 ML21067A182 ML21067A183 ML21067A184 ML21067A185 ML21067A186 ML21067A187 ML21067A188 ML21067A189 ML21067A190 ML21067A191 ML21067A192 ML21067A193 ML21067A195 ML21067A196 ML21067A197 ML21067A198 ML21067A199 ML21067A200 ML21067A201 ML21067A202 ML21067A203 ML21067A204 ML21067A205 ML21067A206 ML21067A207 ML21067A208 ML21067A209 ML21067A210 ML21067A211 ML21067A212 ML21067A214 ML21067A215 ML21067A216 ML21067A217 ML21067A218 ML21067A219 ML21067A220 ML21067A221 ML21067A222 ML21067A223 ZS-2021-0001, Penetration Dose Calculation Spreadsheet
References
ZS-2021-0001
Download: ML21067A201 (3)

Text

10212 May 2016 November 2018 December 2018 December 2018 April 2019 April - August 2019 June 2019 September 2019 October 2019 December 2019 10213 April 2016 November 2018 December 2018 December 2018 April 2019 June 2019 July 2019 August 2019 September 2019 October 2019 November 2019 January 2020 10214 June 2017 November 2018 March 2019 June 2019 November 2019 December 2019

Initial FSS was performed in Class 3 survey unit 10212A.

The drainage ditch in the southern portion of 10212A (now 10212D) was overflowed and caused the flooding of po FSS was re-performed in survey unit 10212A after the removal of additional buried pipe discovered in the survey unit. During this FSS, residual radioactivity was identified at levels greater than the OpDCGL; FSS failed.

Survey unit 10212A was broken into three survey units: Class 1 survey units 10212C and 10212D, and Class 2 surv An FSS readiness survey was performed under an RA. Samples with concentrations greater than the OpDCGL were identified in survey unit 10212D (where the drainage ditch resides), and the elevated areas were targeted for remediation Several rounds of remediation were performed in and around the drainage ditch (mainly 10212D, but a portion of 10212C was also remediated due to its proximity to the ditch).

A surveillance survey was performed to assess the radiological impact of the December 2018 flooding event.

Final FSS was performed in Class 1 survey units 10212C and 10212D.

Final FSS was performed in Class 2 survey unit 10212A.

FSS was performed in Class 3 survey unit 10212D.

Initial FSS was performed in Class 3 survey unit 10213A.

The drainage ditch in the southern portion of 10212A (now 10212D) was overflowed and caused the flooding of po FSS was re-performed in survey unit 10213A after the removal of additional buried pipe discovered in the survey unit. During this FSS, residual radioactivity was identified at levels greater than the OpDCGL; FSS failed.

Survey unit 10213A was broken into three survey units: Class 1 survey units 10213B and 10213C, and Class 2 surv An FSS readiness survey was performed under an RA with no significant findings.

A surveillance survey was performed to assess the radiological impact of the December 2018 flooding event.

An additional FSS readiness survey was performed in survey unit 10213A under an RA with no significant findings Final FSS was performed in Class 2 survey unit 10213A.

An additional FSS readiness survey was performed in survey unit 10213B under an RA with no significant findings An additional FSS readiness survey was performed in survey unit 10213C under an RA with no significant findings Final FSS was performed in Class 1 survey unit 10213B.

Final FSS was performed in Class 1 survey unit 10213C.

Class 3 survey unit 10214 was broken into four survey units: Class 2 survey units 10214A, 10214B, 10214C, and 10214D. This reclassification was due to changing radiological and operational conditions brough about by site decommissioning activities inside or adjacent to 10214 The drainage ditch in the southern portion of 10212A (now 10212D) was overflowed and caused the flooding of po During an RA, a particle is discovered in survey unit 10214D. A portion of survey unit 10214D was reclassified as Class 1 and became survey unit 10214E. Apparent source of the particle is the drainage ditch flooding event.

A surveillance survey was performed to assess the radiological impact of the December 2018 flooding event.

During an RA, a particle is discovered in survey unit 10214C. A portion of survey unit 10214C was reclassified as Class 1 and became survey unit 10214F. Apparent soure of the particle is the drainage ditch flooding event.

FSS was performed in Class 2 survey units 10214A, 10214B, 10214C, and 10214D and Class 1 survey units 10214E

ortions of 10212, 10213, and 10214.

vey unit 10212A.

ortions of 10212, 10213, and 10214.

vey unit 10213A.

s.

s.

s.

ortions of 10212, 10213, and 10214.

E and 10214F.